// clang-format off
#include <bits/stdc++.h>

using namespace std;

#if __cplusplus < 201400
  #warning "Please use c++14 or higher."
  #define INLINE_V
  #define REGISTER_V register
  #define CPP14CONSTEXPR
  #define gcd __gcd
  #define CPP14ENABLE_IF
#elif __cplusplus < 201700
  #define INLINE_V
  #define REGISTER_V
  #define CPP14CONSTEXPR constexpr
  #define gcd __gcd
  #define CPP14ENABLE_IF ,enable_if_t<_is_integer<T>, int> = 0
#else
  #define INLINE_V inline
  #define REGISTER_V
  #define CPP14CONSTEXPR constexpr
  #define CPP14ENABLE_IF ,enable_if_t<_is_integer<T>, int> = 0
#endif

#if !defined(_WIN32) && !defined(LOCK_GETCHAR)
  #define getchar getchar_unlocked
#endif

#define il inline
#define mkp make_pair
#define fi first
#define se second
#define For(i,j,k) for(REGISTER_V int i=(j);i<=(k);++i) // NOLINT
#define ForDown(i,j,k) for(REGISTER_V int i=(j);i>=(k);--i) // NOLINT
#define pb push_back
#define eb emplace_back
#ifndef ONLINE_JUDGE
#define FileIO(filename) freopen(filename".in","r",stdin);freopen(filename".out","w",stdout)
#else
#define FileIO(filename)
#endif

using ll = long long;
// using lll = __int128_t;
using uint = unsigned int;
using ull = unsigned long long;
// using ulll = __uint128_t;
using db = double;
using ldb = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

#if __cplusplus >= 201400
  template <class T> INLINE_V constexpr bool _is_integer = numeric_limits<T>::is_integer;
  // template <> INLINE_V constexpr bool _is_integer<__int128> = true;
  // template <> INLINE_V constexpr bool _is_integer<__uint128_t> = true;
  template <> INLINE_V constexpr bool _is_integer<bool> = false;
  template <> INLINE_V constexpr bool _is_integer<char> = false;
  template <class T CPP14ENABLE_IF>
    INLINE_V constexpr T INF = numeric_limits<T>::max() >> 1;
#endif

template<typename T> constexpr il T sq(const T & x){return x*x;}
template<typename T> CPP14CONSTEXPR il void cmin(T & x, const T &y){x=min(x,y);}
template<typename T> CPP14CONSTEXPR il void cmax(T & x, const T &y){x=max(x,y);}
template<typename T> CPP14CONSTEXPR il T qpow(T x, ull y, T mod){T ans=1;x%=mod;while(y){if(y&1)(ans*=x)%=mod;(x*=x)%=mod;y>>=1;}return ans;}
template<typename T> CPP14CONSTEXPR il T qpow(T x, ull y){T ans=1;while(y){if(y&1)ans*=x;x*=x;y>>=1;}return ans;}
template<typename T CPP14ENABLE_IF> il void read(T &x){ x=0;int f=1;int c=getchar();while(!isdigit(c)){if(c=='-')f=-1;c=getchar();}while(isdigit(c)){x=x*10+c-'0';c=getchar();}x*=f;}
template<typename T, typename ... Args> il void read(T &x, Args &... y){ read(x);read(y...); }

// File head end
// clang-format on

namespace {
constexpr ll MAXN = (1 << 11) + 5;
int n, N;
bitset<MAXN> a[MAXN], b[MAXN];
#define id(x, y) (((x)-1) * N + y)

il void solve() {
  while (n--) {
    for (int i = 0; i < N; i++)
      for (int j = 0; j < N; j++)
        if (a[i][j]) {
          b[i].flip(j);
          b[i].flip((j + (1 << n)) & (N - 1));
          b[i].flip((N + j - (1 << n)) & (N - 1));
          b[(i + (1 << n)) & (N - 1)].flip(j);
          b[(N + i - (1 << n)) & (N - 1)].flip(j);
        }
    copy(b, b + N, a);
    for_each(b, b + N, [&](auto &src) { src.reset(); });
  }
}

il void solver_main() {
  read(n), N = 1 << n;
  int tmp = 0;
  For(i, 0, N - 1) For(j, 0, N - 1) read(tmp), a[i][j] = tmp;
  solve();
  int ans = 0;
  for_each(a, a + N, [&](const auto &src) { ans += src.count(); });
  cout << ans << '\n';
  For(i, 0, N - 1) For(j, 0, N - 1) if (a[i][j]) cout << i << ' ' << j << '\n';
}
} // namespace

signed main() { return solver_main(), 0; }