#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
#define dunk(a) cout << (a) << endl
using namespace std;
typedef long long ll;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	vector<string> a(n);
	vector<string> b(n);
	rep(i, n) {
		cin >> a[i] >> b[i];
	}

    set<string> ans;
	
	rep(i, n) {
		if (find(all(a), b[i]) == a.end()) {
			ans.insert(b[i]);
		}
	}

	rep(i, n) {
		if (find(all(ans), b[i]) != ans.end()) {
			dunk(b[i]);
			ans.erase(b[i]);
		}
	}

	return 0;
}