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