#include<bits/stdc++.h> using namespace std; long long a[100005][3],n,i,ans1=0,ans2=0; unsigned long long a1[10005]; int main() { cin>>n; for(i=1;i<=n;i++) { cin>>a[i][1]>>a[i][2]; a1[i]=a[i][1]*10001+a[i][2]*1; } sort(a1,a1+n+1); for(i=1;i<=n;i++) { ans1=a1[i]/10001; ans2=a1[i]%10001; cout<<ans1<<" "<<ans2; cout<<endl; } return 0; }