#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
    ll n,i;
    cin>>n;
    ll a[n],b[n];
    vector< pair <int,int> > v;
    for(i=0; i<n; i++)
    {
        cin>>a[i]>>b[i];
    }
    for (i=0; i<n; i++)
        v.push_back( make_pair(a[i],b[i]) );
    sort(v.begin(),v.end());

    for (int i=0; i<n; i++)
    {
        cout << v[i].first << " "<< v[i].second << endl;
    }

}