#include <bits/stdc++.h> using namespace std; struct Num { int x, y; void read() { cin >> x >> y; } }; Num a[100005]; bool cmp(Num a, Num b) { if (a.x != b.x) return a.x < b.x; return a.y < b.y; } int main() { int n; cin >> n; for (int i = 1; i <= n; i++) a[i].read(); sort(a + 1, a + n + 1, cmp); for (int i = 1; i <= n; i++) cout << a[i].x << " " << a[i].y << endl; return 0; }