#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

int main(){
    int n;
    cin >> n;
    vector<string> v;
    string s, t;
    for(int i = 0; i < n; i++){
        cin >> s >> t;
        s += " ";
        s += t;
        v.push_back(s);
    }
    sort(v.begin(), v.end());
    for(string u : v)   cout << u << endl;
    return 0;
}