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

int main() {
    int n;
    cin >> n;
    vector<string> a(n), b(n);
    for (int i = 0; i < n; i++) {
        cin >> a.at(i) >> b.at(i);
    }

    set<string> s;
    for (int i = 0; i < n; i++) {
        s.insert(b.at(i));
    }
    for (int i = 0; i < n; i++) {
        s.erase(a.at(i));
    }

    for (int i = 0; i < n; i++) {
        if (s.count(b.at(i))) {
            cout << b.at(i) << endl;
            s.erase(b.at(i));
        }
    }
}