#include <iostream>
#include <vector>
using namespace std;

int main () {
    int n, m;
    cin >> n >> m;
    vector <vector <int> > a (n,
        vector <int> (n, 0));
    for (int j = 0; j < m; j++) {
        int u, v;
        cin >> u >> v;
        u -= 1;
        v -= 1;
        a[u][v] = 1;
        a[v][u] = 1;
    }
    return 0;
}