#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = std::int_fast64_t;
using std::cout;
using std::cerr;
using std::endl;
using std::cin;

template<typename T>
std::vector<T> make_v(size_t a){return std::vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

int main() {
	int n; scanf("%d", &n);
	std::vector<std::string> vec(n);
	std::map<std::string, bool> mp;
	for(int i = 0; i < n; i++) {
		std::string s, t; cin >> s >> vec[i];

		mp[s] = true;
	}
	
	int ans = 0;
	for(auto v: vec) {
		if(mp[v]) continue;

		printf("%s\n", v.c_str());
	}
	return 0;
}