#include <bits/stdc++.h> using namespace std; int v[10005][10005]; int n,x,y; signed main() { cin >> n; for(int i = 1; i <= n; i++) { scanf("%d%d",&x,&y); //cin >> x >> y; v[x][y]++; } for(int i = 1; i <= 10000; i++) { for(int j = 1; j <= 10000; j++) { if(v[i][j]) { for(int k = 1; k <= v[i][j]; k++) { //cout << i << " " << j << endl; printf("%d %d\n",i,j); } } } } return 0; }