#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <cmath>
#include <cstring>
#include <iomanip>
#include <random>
#include <chrono>
#include <queue>
using namespace std;
typedef long long ll;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
#define fs first
#define sc second
#define INF 1000000000
#define MOD 1000000007
#define EPS 0.00000001

int main() {
    int N; cin >> N;
    vector<string> V(N);
    for(string &S:V){
        string a, b; cin >> a >> b;
        a += " ";
        a += b;
        S = a;
    }
    
    sort(V.begin(), V.end());
    for(string &S:V)
        cout << S << endl;
    return 0;
}