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

int main () {
    int n, m;
    cin >> n >> m;
    vector <vector <int> > adj (n);

    for (int j = 0; j < m; j++) {
        int u, v;
        cin >> u >> v;
        u -= 1;
        v -= 1;
        adj[u].push_back (v);

    }
    return 0;
}