#include <bits/stdc++.h>

int main() {
    int n;
    scanf("%d", &n);
    std::pair<std::string, std::string> a[n - 1];
    std::set<std::string> pos;
    for (auto &i : a) {
        std::cin >> i.first >> i.second;
        pos.insert(i.second);
    }
    for (auto &i : a) pos.erase(i.first);
    for (auto &i : a) {
        if (pos.count(i.second)) std::cout << i.second << std::endl, pos.erase(i.second);
    }
    
    return 0;
}