#include <bits/stdc++.h>
using namespace std;

double b1[] = {169.726,169.735,169.744,169.829,169.914,169.908,169.916,170.001,170.010,170.039,169.660,169.744,169.829,169.849,169.857,169.941,169.961,170.045,170.130,170.149,170.169,170.121,170.113,170.121,170.205,170.289,170.373,170.323,170.265,170.349,170.223,170.307,170.391,170.382,170.466,170.473,170.557,170.640,170.724,170.808,170.892,170.833,170.916,171.000,171.084,170.882,170.810,170.816,170.834,170.783,170.789,170.729,170.812,170.895,170.798,170.881,170.922,170.873,170.956,170.883,170.966,171.049,171.083,171.100,171.104,171.094,171.120,171.136,171.153,171.169,171.195,171.221,171.147,171.229,171.217,171.300,171.316,171.188,171.142,171.225,171.183,171.266,171.269,171.351,171.355,171.437,171.519,171.601,171.617,171.507,171.532,171.614,171.617,171.699,171.781,171.863,171.866,171.948,172.030,172.032,172.035,172.117,172.199,172.047,172.062,172.144,172.158,172.094,172.175,172.257,172.300,172.382,172.463,172.289,172.370,172.452,172.475,172.557,172.638,172.720,172.721,172.802,172.884,172.897,172.979,172.912,172.993,172.909,172.991,173.072,173.153,173.235,173.248,173.248,173.329,173.249,173.279,173.228,173.251,173.332,173.344,173.293,173.374,173.455,173.455,173.536,173.617,173.629,173.650,173.672,173.753,173.834,173.833,173.914,173.943,174.024,174.036,174.117,174.116,174.045,174.126,174.055,174.067,174.147,174.228,174.239,174.319,174.355,174.353,174.433,174.462,174.543,174.481,174.337,174.417,174.497,174.508,174.588,174.616,174.697,174.777,174.805,174.786,174.796,174.876,174.956,175.036,175.116,175.197,175.277,175.296,175.377,175.386,175.383,175.380,175.390,175.470,175.550,175.559,175.556,175.635,175.632,175.712,175.650,175.730,175.726,175.622,175.702,175.781,175.861,175.940,175.949,175.945,175.954,176.033,176.052,176.047,176.043,176.038,176.118,176.197,176.276,176.356,176.435,176.514,176.509,176.528,176.536,176.472,176.551,176.559,176.482,176.424,176.431,176.510,176.589,176.668,176.639,176.718,176.672,176.607,176.614,176.570,176.649,176.602,176.402,176.481,176.559,176.638,176.716,176.795,176.801,176.880,176.958,176.807,176.886,176.964,177.042,177.035,177.041,177.120,177.136,177.129,177.207,177.137,177.216,177.232,177.310,177.388,177.393,177.253,177.331,177.410,177.434,177.512,177.527,177.605,177.683,177.707,177.722,177.727,177.805,177.883,177.961,177.953,178.031,178.035,177.985,178.063,178.068,178.091,178.169,178.246,178.324,178.178,178.256,178.334,178.412,178.416,178.445,178.523,178.601,178.678,178.708,178.712,178.789,178.681,178.685,178.688,178.766,178.769,178.847,178.924,179.001,179.015,179.029,179.106,179.184,179.261,179.264,179.267,179.344,179.347,179.424,179.413,179.491,179.416,179.438,179.451,179.528,179.605,179.538,179.353,179.355,179.357,179.359,179.436,179.424,179.437,179.449,179.451,179.528,179.605,179.638,179.715,179.791,179.793,179.870,179.946,180.023,180.035,179.916,179.852,179.929,179.930,179.841,179.918,179.873,179.950,180.026,180.102,180.179,180.255,180.331,180.407,180.419,180.405,180.406,180.482,180.558,180.634,180.711,180.787,180.798,180.809,180.829,180.905,180.916,180.915,180.926,181.002,181.078,181.154,181.064,181.140,181.216,181.215,181.234,181.245,181.255,181.331,181.407,181.482,181.482,181.557,181.568,181.586,181.662,181.738,181.814,181.824,181.899,181.975,182.051,182.069,182.068,182.144,182.219,182.218,182.177,182.162,182.160,182.235,182.311,182.386,182.462,182.538,182.547,182.622,182.620,182.696,182.694,182.769,182.767,182.785,182.782,182.858,182.933,183.008,183.084,183.023,183.099,183.107,183.116,183.113,183.188,183.263,183.182,183.124,183.199,183.196,183.271,183.346,183.354,183.351,183.426,183.375,183.332,183.328,183.336,183.344,183.360,183.298,183.321,183.396,183.404,183.478,183.553,183.628,183.477,183.552,183.626,183.575,183.412,183.394,183.237,183.253,183.327,183.322,183.396,183.344,183.418,183.492,183.295,183.369,183.443,183.517,183.540,183.478,183.393,183.467,183.541,183.615,183.689,183.615,183.630,183.703,183.718,183.792,183.866,183.940,183.797,183.871,183.885,183.847,183.841,183.915,183.989,183.994,184.015,184.089,184.163,184.104,184.045,184.050,183.986,184.059,184.133,184.206,184.211,184.284,184.217,184.141,184.162,184.235,184.308,184.313,184.264,184.337,184.261,184.265,184.222,184.175,184.248,184.321,184.334,184.347,184.420,184.354,184.427,184.500,184.573,184.646,184.459,184.462,184.535,184.608,184.680,184.753,184.745,184.748,184.704,184.777,184.779,184.782,184.855,184.858,184.930,185.003,185.005,185.078,185.150,185.162,185.165,185.155,185.085,185.076,185.148,185.078,185.068,185.140,185.152,185.142,185.214,185.155,185.157,185.158,184.958,184.959,184.970,185.042,185.053,185.125,185.197,185.269,185.279,185.351,185.423,185.424,185.496,185.568,185.640,185.712,185.730,185.610,185.621,185.639,185.710,185.699,185.771,185.710,185.710,185.711,185.783,185.771,185.781,185.852,185.800,185.872,185.943,185.961,186.032,185.988,186.059,186.131,186.202,186.274,186.345,186.417,186.416,186.488,186.559,186.559,186.559,186.576,186.439,186.372,186.443,186.376,186.375,186.326,186.270,186.341,186.340,186.349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double b2[] = 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const int N = 1050;
const int LAMBDA = 7000;

int n, m;
set<int> e[N];
int f[N];
int id[N];
int Find(int x) { return x == f[x] ? x : f[x] = Find(f[x]); }

bool is_con(int u, int v) {
    int fu = Find(u), fv = Find(v);
    return fu == fv;
}

void connect(int u, int v) {
    int fu = Find(u), fv = Find(v);
    if (fu != fv)
        f[fv] = fu;
}

using pii = pair<int, int>;

void work_mark() {
    for (int i = 1; i <= n; i++)
        id[i] = i;

    for (int i = 1; i <= n; i++)
        for (auto v : e[i])
            connect(i, v);

    int cnt = 5;
    sort(id + 1, id + n + 1, [](auto x, auto y) {
        return e[x].size() > e[y].size();
    });

    int u = id[1];
    vector<pii> vec;

    for (int i = 1; i <= n; i++) {
        if (u == i)
            continue;
        if (e[u].find(i) == e[u].end()) {
            cnt--;
            vec.emplace_back(u, i);
            if (cnt == 0) break;
        }
    }

    cout << "mark\n";
    cout << vec.size() << "\n";
    for (auto [u, v] : vec) {
        cout << u << " " << v << "\n";
    }
}

int main() {
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= m; i++) {
        int u, v;
        scanf("%d%d", &u, &v);
        e[u].insert(v);
        e[v].insert(u);
    }

    int mx = 0;
    for (int i = 1; i <= n; i++)
        mx = max(mx, (int)e[i].size());
    sort(id + 1, id + n + 1, [](auto x, auto y) {
        return e[x].size() > e[y].size();
    });

    int cnt = e[1].size() - e[2].size();
    if(cnt>=5){
        puts("ok"); return 0;
    }
    // cerr << "isolate: " << isolate << endl;
    // double val = (double)m / mx;
    // if (abs(val - b2[m - 2000]) * 1.6 < abs(val - b1[m - 2000])) {
    //     cout << "ok" << endl;
    //     return 0;
    // }

    work_mark();

    return 0;
}