#include <iostream>
#include <string>
#include <algorithm>
#include <utility>

using namespace std;

int n;
pair<string, string> p[55];

int main(void)
{
	cin >> n;
	string s, t;
	for(int i = 1; i <= n; i++){
		cin >> s >> t;
		p[i] = make_pair(s, t);
	}
	sort(p+1, p+n+1);
	
	for(int i = 1 ; i <= n; i++){
		cout << p[i].first << " " << p[i].second << endl;
	}
	return 0;
}