#include<fstream>
using namespace std;
ifstream in ("felinare.in");
ofstream out ("felinare.out");
int
int main (void) {
    in >> n >> m;
    for (int i = 1; i <= n; i ++) {
        in >> a >> b;
        v[a].push_back(b);
    }

    return 0;
}