#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int N;
	cin >> N;
	map<string, int> mm;
	REP(i, N) {
		string a, b;
		cin >> a >> b;
		mm[a] = -1;
		if (!mm.count(b)) {
			int c = mm.size();
			mm[b] = c;
		}
	}
	vector<pair<int, string>> ans;
	for (auto && [s, i] : mm) if (i != -1) ans.emplace_back(i, s);
	sort(ALL(ans));
	for (auto && [_, s] : ans) cout << s << '\n';
}