#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n;
	cin >> n;

	int cnt = 0;
	map<string, int> mp;
	vector<int> v;
	vector<string> nm;
	rep(i, n){
		string s, t;
		cin >> s >> t;

		if(mp.count(t) == 0) {
			mp[t] = cnt;
			cnt++;
			v.push_back(-1);
			nm.push_back(t);
		}

		if(mp.count(s) == 0){
			mp[s] = cnt;
			cnt++;
			v.push_back(-1);
			nm.push_back(s);
		}

		v[mp[s]] = mp[t];
	}

	int m = v.size();
	rep(i, m){
		if(v[i] == -1){
			cout << nm[i] << "\n";
		}
	}
}