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

int main(){

	int testes;
	vector<vector<int> > matrix;
	cin >> testes;

	int n,m;

	cin >> n >> m;

	for(int i = 0; i < n;i++){
		vector<int> vazia;
		matrix.push_back(vazia);
	}

	for(int i = 1; i <m;i++){
			int x,y;
			vector<int> lista;
			cin >> x >> y;
			lista.push_back(y);
			matrix.at(x)= lista;
	}
	for(int i = 1; m >i;i++){
		printf("%d", matrix.at(i));
	}