# include <bits/stdc++.h> using namespace std ; struct dui { int a , b ; } ; dui d [114514] ; bool cmp ( dui x , dui y ) { if ( x . a != y . a ) { return x . a < y . a ; } return x . b < y . b ; } int main ( ) { int n ; cin >> n ; for ( int i = 1 ; i <= n ; i ++ ) { cin >> d [i] . a >> d [i] . b ; } sort ( d + 1 , d + n + 1 , cmp ) ; for ( int i = 1 ; i <= n ; i ++ ) { cout << d [i] . a << ' ' << d [i] . b << endl ; } return 0 ; }