/**
 * date   : 2023-09-05 22:45:20
 * author : Nyaan
 */

#define NDEBUG

// old version of ARC139C

/**
 *  date : 2022-04-17 17:40:33
 */

#define NDEBUG
using namespace std;

// intrinstic
#include <immintrin.h>


#include <algorithm>

#include <array>

#include <bitset>

#include <cassert>

#include <cctype>

#include <cfenv>

#include <cfloat>

#include <chrono>

#include <cinttypes>

#include <climits>

#include <cmath>

#include <complex>

#include <cstdarg>

#include <cstddef>

#include <cstdint>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <deque>

#include <fstream>

#include <functional>

#include <initializer_list>

#include <iomanip>

#include <ios>

#include <iostream>

#include <istream>

#include <iterator>

#include <limits>

#include <list>

#include <map>

#include <memory>

#include <new>

#include <numeric>

#include <ostream>

#include <queue>

#include <random>

#include <set>

#include <sstream>

#include <stack>

#include <streambuf>

#include <string>

#include <tuple>

#include <type_traits>

#include <typeinfo>

#include <unordered_map>

#include <unordered_set>

#include <utility>

#include <vector>


// utility
namespace Nyaan {
using ll = long long;
using i64 = long long;
using u64 = unsigned long long;
using i128 = __int128_t;
using u128 = __uint128_t;

template <typename T>
using V = vector<T>;
template <typename T>
using VV = vector<vector<T>>;
using vi = vector<int>;
using vl = vector<long long>;
using vd = V<double>;
using vs = V<string>;
using vvi = vector<vector<int>>;
using vvl = vector<vector<long long>>;

template <typename T, typename U>
struct P : pair<T, U> {
  template <typename... Args>
  P(Args... args) : pair<T, U>(args...) {}

  using pair<T, U>::first;
  using pair<T, U>::second;

  P &operator+=(const P &r) {
    first += r.first;
    second += r.second;
    return *this;
  }
  P &operator-=(const P &r) {
    first -= r.first;
    second -= r.second;
    return *this;
  }
  P &operator*=(const P &r) {
    first *= r.first;
    second *= r.second;
    return *this;
  }
  template <typename S>
  P &operator*=(const S &r) {
    first *= r, second *= r;
    return *this;
  }
  P operator+(const P &r) const { return P(*this) += r; }
  P operator-(const P &r) const { return P(*this) -= r; }
  P operator*(const P &r) const { return P(*this) *= r; }
  template <typename S>
  P operator*(const S &r) const {
    return P(*this) *= r;
  }
  P operator-() const { return P{-first, -second}; }
};

using pl = P<ll, ll>;
using pi = P<int, int>;
using vp = V<pl>;

constexpr int inf = 1001001001;
constexpr long long infLL = 4004004004004004004LL;

template <typename T>
int sz(const T &t) {
  return t.size();
}

template <typename T, typename U>
inline bool amin(T &x, U y) {
  return (y < x) ? (x = y, true) : false;
}
template <typename T, typename U>
inline bool amax(T &x, U y) {
  return (x < y) ? (x = y, true) : false;
}

template <typename T>
inline T Max(const vector<T> &v) {
  return *max_element(begin(v), end(v));
}
template <typename T>
inline T Min(const vector<T> &v) {
  return *min_element(begin(v), end(v));
}
template <typename T>
inline long long Sum(const vector<T> &v) {
  return accumulate(begin(v), end(v), 0LL);
}

template <typename T>
int lb(const vector<T> &v, const T &a) {
  return lower_bound(begin(v), end(v), a) - begin(v);
}
template <typename T>
int ub(const vector<T> &v, const T &a) {
  return upper_bound(begin(v), end(v), a) - begin(v);
}

constexpr long long TEN(int n) {
  long long ret = 1, x = 10;
  for (; n; x *= x, n >>= 1) ret *= (n & 1 ? x : 1);
  return ret;
}

template <typename T, typename U>
pair<T, U> mkp(const T &t, const U &u) {
  return make_pair(t, u);
}

template <typename T>
vector<T> mkrui(const vector<T> &v, bool rev = false) {
  vector<T> ret(v.size() + 1);
  if (rev) {
    for (int i = int(v.size()) - 1; i >= 0; i--) ret[i] = v[i] + ret[i + 1];
  } else {
    for (int i = 0; i < int(v.size()); i++) ret[i + 1] = ret[i] + v[i];
  }
  return ret;
};

template <typename T>
vector<T> mkuni(const vector<T> &v) {
  vector<T> ret(v);
  sort(ret.begin(), ret.end());
  ret.erase(unique(ret.begin(), ret.end()), ret.end());
  return ret;
}

template <typename F>
vector<int> mkord(int N,F f) {
  vector<int> ord(N);
  iota(begin(ord), end(ord), 0);
  sort(begin(ord), end(ord), f);
  return ord;
}

template <typename T>
vector<int> mkinv(vector<T> &v) {
  int max_val = *max_element(begin(v), end(v));
  vector<int> inv(max_val + 1, -1);
  for (int i = 0; i < (int)v.size(); i++) inv[v[i]] = i;
  return inv;
}

vector<int> mkiota(int n) {
  vector<int> ret(n);
  iota(begin(ret), end(ret), 0);
  return ret;
}

template <typename T>
T mkrev(const T &v) {
  T w{v};
  reverse(begin(w), end(w));
  return w;
}

template <typename T>
bool nxp(vector<T> &v) {
  return next_permutation(begin(v), end(v));
}



#define inV(T, v, n) \
  vector<T> v(n);    \
  in(v)

#define inVV(T, v, h, w)                \
  vector<vector<T>> v(h, vector<T>(w)); \
  in(v);

template <typename T>
using minpq = priority_queue<T, vector<T>, greater<T>>;

// 区間：半開区間 (ng, ok] または [ok, ng)
template <typename T, typename F>
T binary_search(T ng, T ok, const F& f) {
  if constexpr (is_integral<T>::value == true) {
    while (abs(ok - ng) > 1) {
      T x = (ok + ng) / 2;
      (f(x) ? ok : ng) = x;
    }
    return ok;
  } else {
    for (int iter = 0; iter < 60; iter++) {
      T x = (ok + ng) / 2;
      (f(x) ? ok : ng) = x;
    }
    return ok;
  }
}

// 解区間 (l, r)
template <typename T, typename F>
void ternary_search(T l, T r, const F& f, bool greater = false) {
  if constexpr (is_integral<T>::value == true) {
    while (abs(l - r) > 2) {
      T llr = (l * 2 + r * 1) / 3;
      T lrr = (l * 1 + r * 2) / 3;
      bool flag = f(llr) < f(lrr);
      if (flag != greater) {
        r = lrr;
      } else {
        l = llr;
      }
    }
    return (l + r) / 2;
  } else {
    for (int iter = 0; iter < 80; iter++) {
      T llr = (l * 2 + r * 1) / 3;
      T lrr = (l * 1 + r * 2) / 3;
      bool flag = f(llr) < f(lrr);
      if (flag != greater) {
        r = lrr;
      } else {
        l = llr;
      }
    }
    return (l + r) / 2;
  }
}

}  // namespace Nyaan

// bit operation
namespace Nyaan {
__attribute__((target("popcnt"))) inline int popcnt(const u64 &a) {
  return _mm_popcnt_u64(a);
}
inline int lsb(const u64 &a) { return a ? __builtin_ctzll(a) : 64; }
inline int ctz(const u64 &a) { return a ? __builtin_ctzll(a) : 64; }
inline int msb(const u64 &a) { return a ? 63 - __builtin_clzll(a) : -1; }
template <typename T>
inline int gbit(const T &a, int i) {
  return (a >> i) & 1;
}
template <typename T>
inline void sbit(T &a, int i, bool b) {
  if (gbit(a, i) != b) a ^= T(1) << i;
}
constexpr long long PW(int n) { return 1LL << n; }
constexpr long long MSK(int n) { return (1LL << n) - 1; }
}  // namespace Nyaan

// inout
namespace Nyaan {

template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
  os << p.first << " " << p.second;
  return os;
}
template <typename T, typename U>
istream &operator>>(istream &is, pair<T, U> &p) {
  is >> p.first >> p.second;
  return is;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v) {
  int s = (int)v.size();
  for (int i = 0; i < s; i++) os << (i ? " " : "") << v[i];
  return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v) {
  for (auto &x : v) is >> x;
  return is;
}

istream &operator>>(istream &is, __int128_t &x) {
  string S;
  is >> S;
  x = 0;
  int flag = 0;
  for (auto &c : S) {
    if (c == '-') {
      flag = true;
      continue;
    }
    x *= 10;
    x += c - '0';
  }
  if (flag) x = -x;
  return is;
}

istream &operator>>(istream &is, __uint128_t &x) {
  string S;
  is >> S;
  x = 0;
  for (auto &c : S) {
    x *= 10;
    x += c - '0';
  }
  return is;
}

ostream &operator<<(ostream &os, __int128_t x) {
  if (x == 0) return os << 0;
  if (x < 0) os << '-', x = -x;
  string S;
  while (x) S.push_back('0' + x % 10), x /= 10;
  reverse(begin(S), end(S));
  return os << S;
}
ostream &operator<<(ostream &os, __uint128_t x) {
  if (x == 0) return os << 0;
  string S;
  while (x) S.push_back('0' + x % 10), x /= 10;
  reverse(begin(S), end(S));
  return os << S;
}

void in() {}
template <typename T, class... U>
void in(T &t, U &...u) {
  cin >> t;
  in(u...);
}

void out() { cout << "\n"; }
template <typename T, class... U, char sep = ' '>
void out(const T &t, const U &...u) {
  cout << t;
  if (sizeof...(u)) cout << sep;
  out(u...);
}

void outr() {}
template <typename T, class... U, char sep = ' '>
void outr(const T &t, const U &...u) {
  cout << t;
  outr(u...);
}

struct IoSetupNya {
  IoSetupNya() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    cerr << fixed << setprecision(7);
  }
} iosetupnya;

}  // namespace Nyaan

// debug

#ifdef NyaanDebug
#define trc(...) (void(0))
#else
#define trc(...) (void(0))
#endif

// macro
#define each(x, v) for (auto&& x : v)
#define each2(x, y, v) for (auto&& [x, y] : v)
#define all(v) (v).begin(), (v).end()
#define rep(i, N) for (long long i = 0; i < (long long)(N); i++)
#define repr(i, N) for (long long i = (long long)(N)-1; i >= 0; i--)
#define rep1(i, N) for (long long i = 1; i <= (long long)(N); i++)
#define repr1(i, N) for (long long i = (N); (long long)(i) > 0; i--)
#define reg(i, a, b) for (long long i = (a); i < (b); i++)
#define regr(i, a, b) for (long long i = (b)-1; i >= (a); i--)
#define fi first
#define se second
#define ini(...)   \
  int __VA_ARGS__; \
  in(__VA_ARGS__)
#define inl(...)         \
  long long __VA_ARGS__; \
  in(__VA_ARGS__)
#define ins(...)      \
  string __VA_ARGS__; \
  in(__VA_ARGS__)
#define in2(s, t)                           \
  for (int i = 0; i < (int)s.size(); i++) { \
    in(s[i], t[i]);                         \
  }
#define in3(s, t, u)                        \
  for (int i = 0; i < (int)s.size(); i++) { \
    in(s[i], t[i], u[i]);                   \
  }
#define in4(s, t, u, v)                     \
  for (int i = 0; i < (int)s.size(); i++) { \
    in(s[i], t[i], u[i], v[i]);             \
  }
#define die(...)             \
  do {                       \
    Nyaan::out(__VA_ARGS__); \
    return;                  \
  } while (0)

namespace Nyaan {
void solve();
}
int main() { Nyaan::solve(); }

//

using namespace Nyaan;

void wt(int S, vi x, vi y) {
  trc(S, x, y);
  assert(sz(x) == S);
  out(S);
  rep(i, S) out(x[i], y[i]);
  exit(0);
}

void q() {
  ini(N, M);
  if (N == 1 and M == 1) {
    int S = 1;
    vi X{1}, Y{1};
    wt(S, X, Y);
  }
  if (N == M) {
    int S = N + M - 2;
    vi X, Y;
    rep1(i, N) {
      X.push_back(1), Y.push_back(i);
      if (i != 1 and i != N) X.push_back(N), Y.push_back(i);
    }
    wt(S, X, Y);
  }

  int rev = 0;
  if (N > M) rev = 1, swap(N, M);
  if (N % 2 == 1) {
    vi X, Y;
    rep1(i, N) {
      X.push_back(i);
      Y.push_back(1);
      X.push_back(i);
      Y.push_back(M);
    }
    int d = (N + 1) / 2;
    for (int j = d + 1; j + d <= M; j++) {
      X.push_back(d);
      Y.push_back(j);
    }
    if (rev) swap(X, Y);
    wt(N + M - 1, X, Y);
  }

  vi X, Y;
  rep1(i, N) {
    X.push_back(i), Y.push_back(1);
    X.push_back(i), Y.push_back(M);
  }
  int d = N / 2;
  for (int j = d + 2; j + d + 1 <= M; j += 2) {
    X.push_back(d + 0), Y.push_back(j);
    X.push_back(d + 1), Y.push_back(j);
  }
  int S = N + M - 1 - (M % 2 == 0);
  if (rev) swap(X, Y);
  wt(S, X, Y);
}

void Nyaan::solve() {
  int T = 1;

  // in(T);

  while (T--) q();
}