#include <bits/stdc++.h>
using namespace std;

int main() {
	int n; cin >> n;
	string a[n], b[n];
	set<string> A;
	for(int i = 0; i < n; ++i) {
		cin >> a[i] >> b[i];
		A.emplace(a[i]);
	}
	set<string> ans;
	for(int i = 0; i < n; ++i) {
		if(A.find(b[i]) == A.end()) {
			ans.emplace(b[i]);
		}
	}
	for(int i = 0; i < n; ++i) {
		auto itr = ans.find(b[i]);
		if(itr != ans.end()) {
			cout << b[i] << '\n';
			ans.erase(itr);
		}
	}
	return 0;
}