#include<bits/stdc++.h> using namespace std; struct fly { int a,b; }f[10000009]; bool cmp(fly x,fly y) { if(x.a==y.a)return x.b<y.b; else return x.a<y.a; } int main() { //freopen("power.in","r",stdin); //freopen("power.out","w",stdout); int t; cin>>t; for(int i=1;i<=t;i++) { cin>>f[i].a>>f[i].b; } sort(f+1,f+1+t,cmp); for(int i=1;i<=t;i++) { cout<<f[i].a<<' '<<f[i].b<<endl; } return 0; }