#line 2 "/Users/noya2/Desktop/Noya2_library/template/template.hpp"
using namespace std;

#include<bits/stdc++.h>
#line 1 "/Users/noya2/Desktop/Noya2_library/template/inout_old.hpp"
namespace noya2 {

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;
}

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...);
}

template<typename T>
void out(const vector<vector<T>> &vv){
    int s = (int)vv.size();
    for (int i = 0; i < s; i++) out(vv[i]);
}

struct IoSetup {
    IoSetup(){
        cin.tie(nullptr);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(15);
        cerr << fixed << setprecision(7);
    }
} iosetup_noya2;

} // namespace noya2
#line 1 "/Users/noya2/Desktop/Noya2_library/template/const.hpp"
namespace noya2{

const int iinf = 1'000'000'007;
const long long linf = 2'000'000'000'000'000'000LL;
const long long mod998 =  998244353;
const long long mod107 = 1000000007;
const long double pi = 3.14159265358979323;
const vector<int> dx = {0,1,0,-1,1,1,-1,-1};
const vector<int> dy = {1,0,-1,0,1,-1,-1,1};
const string ALP = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string alp = "abcdefghijklmnopqrstuvwxyz";
const string NUM = "0123456789";

void yes(){ cout << "Yes\n"; }
void no(){ cout << "No\n"; }
void YES(){ cout << "YES\n"; }
void NO(){ cout << "NO\n"; }
void yn(bool t){ t ? yes() : no(); }
void YN(bool t){ t ? YES() : NO(); }

} // namespace noya2
#line 1 "/Users/noya2/Desktop/Noya2_library/template/utils.hpp"
namespace noya2{

unsigned long long inner_binary_gcd(unsigned long long a, unsigned long long b){
    if (a == 0 || b == 0) return a + b;
    int n = __builtin_ctzll(a); a >>= n;
    int m = __builtin_ctzll(b); b >>= m;
    while (a != b) {
        int mm = __builtin_ctzll(a - b);
        bool f = a > b;
        unsigned long long c = f ? a : b;
        b = f ? b : a;
        a = (c - b) >> mm;
    }
    return a << min(n, m);
}

template<typename T> T gcd_fast(T a, T b){ return static_cast<T>(inner_binary_gcd(abs(a),abs(b))); }

long long sqrt_fast(long long n) {
    if (n <= 0) return 0;
    long long x = sqrt(n);
    while ((x + 1) * (x + 1) <= n) x++;
    while (x * x > n) x--;
    return x;
}

template<typename T> T floor_div(const T n, const T d) {
    assert(d != 0);
    return n / d - static_cast<T>((n ^ d) < 0 && n % d != 0);
}

template<typename T> T ceil_div(const T n, const T d) {
    assert(d != 0);
    return n / d + static_cast<T>((n ^ d) >= 0 && n % d != 0);
}

template<typename T> void uniq(vector<T> &v){
    sort(v.begin(),v.end());
    v.erase(unique(v.begin(),v.end()),v.end());
}

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

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

template<typename T> inline bool range(T l, T x, T r){ return l <= x && x < r; }

} // namespace noya2
#line 8 "/Users/noya2/Desktop/Noya2_library/template/template.hpp"

#define rep(i,n) for (int i = 0; i < (int)(n); i++)
#define repp(i,m,n) for (int i = (m); i < (int)(n); i++)
#define reb(i,n) for (int i = (int)(n-1); i >= 0; i--)
#define all(v) (v).begin(),(v).end()

using ll = long long;
using ld = long double;
using uint = unsigned int;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pil = pair<int,ll>;
using pli = pair<ll,int>;

namespace noya2{

/*　~ (. _________ . /)　*/

}

using namespace noya2;


#line 2 "c.cpp"

#line 2 "/Users/noya2/Desktop/Noya2_library/misc/rng.hpp"

#line 4 "/Users/noya2/Desktop/Noya2_library/misc/rng.hpp"

namespace noya2 {

// [0, 2^64 - 1)
ull rng() {
  static ull _x = 88172645463325252UL;
  return _x ^= _x << 7, _x ^= _x >> 9;
}

// [l, r]
ll rng(ll l, ll r) {
  assert(l <= r);
  return l + rng() % ull(r - l + 1);
}

// [l, r)
ll randint(ll l, ll r) {
  assert(l < r);
  return l + rng() % ull(r - l);
}

// [0.0, 1.0)
ld rnd() { return rng() * 5.42101086242752217004e-20; }
// [l, r)
ld rnd(ld l, ld r) {
  assert(l < r);
  return l + rnd() * (r - l);
}

} // namespace noya2
#line 4 "c.cpp"

ll tot = 0, cnt = 0;
map<int,ll> mp;

void jikken(){
    int n = 1000;
    int m = 5000;
    set<pii> st;
    vector<int> deg(n,0);
    rep(tt,m){
        while (true){
            int u = randint(0,n);
            int v = randint(0,n);
            if (u > v) swap(u,v);
            if (u == v) continue;
            if (st.contains(pii(u,v))) continue;
            st.insert(pii(u,v));
            deg[u]++;
            deg[v]++;
            break;
        }
    }
    int mi = iinf, ma = -1;
    rep(i,n){
        chmin(mi,deg[i]);
        chmax(ma,deg[i]);
    }
    tot += ma;
    cnt += 1;
    mp[ma]++;
}

void solve(){
    // jikken(); return ;
    int n, m; in(n,m);
    vector<int> deg(n,0);
    set<pii> st;
    rep(i,m){
        int u, v; in(u,v); u--, v--;
        if (u > v) swap(u,v);
        st.insert(pii(u,v));
        deg[u]++;
        deg[v]++;
    }
    vector<int> ids(n); iota(all(ids),0);
    sort(all(ids),[&](int l, int r){
        return deg[l] > deg[r];
    });
    if (deg[ids[0]] != deg[ids[1]] && deg[ids[1]] != deg[ids[2]]){
        int u = ids[0];
        int v = ids[1];
        if (u > v) swap(u,v);
        if (st.contains(pii(u,v))){
            out("ok");
            return ;
        }
    }
    vector<pii> add;
    if (deg[ids[1]] == deg[ids[2]]){
        add.emplace_back(ids[0],ids[n-1]);
        add.emplace_back(ids[1],ids[n-2]);
    }
    if (deg[ids[0]] == deg[ids[1]]){
        add.emplace_back(ids[0],ids[n-3]);
    }
    {
        int u = ids[0];
        int v = ids[1];
        if (u > v) swap(u,v);
        if (!st.contains(pii(u,v))){
            add.emplace_back(u,v);
        }
    }
    out("mark");
    out(add.size());
    for (auto [u, v] : add){
        out(u+1,v+1);
    }
}

int main(){
    int t = 1; // in(t);
    while (t--) { solve(); }
    // out(tot,cnt);
    // out(ld(tot)/ld(cnt));
    // for (auto [ma, c] : mp) out(ma,c);
}