//
// Created by liuhuan on 18-10-29.
//
#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector <pair<int, int>> v(n);/*相当于一个结构体*/
    for (int i = 0; i < n; i++) cin >> v[i].first >> v[i].second;
    sort(v.begin(), v.end());
    for (auto p:v)
        cout << p.first << " " << p.second << endl;
    return 0;
}