#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <time.h>
#include <stack>
#include <array>
#define popcount __builtin_popcount
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;

int main()
{
    int n;
	cin>>n;
	string a[20020], b[20020];
	map<string, int> mp, mp2;
	for(int i=0; i<n; i++){
		cin>>a[i]>>b[i];
		mp[a[i]]++;
	}
	for(int i=0; i<n; i++){
		if(mp[b[i]]==0 && mp2[b[i]]==0){
			cout<<b[i]<<endl;
			mp2[b[i]]++;
		}
	}
	return 0;
}