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

int main() {
    ll n;
    std::cin >> n;
    
    std::map<string, bool> ok;
    std::map<string, bool> out;
    
    vector<string> ab;
    
    for (int i = 0; i < n; i++) {
        string t1,t2;
        std::cin >> t1>>t2;
        ab.push_back(t2);
        ok[t2] = true;
        out[t1] = true;
    }
    
    for (int i = 0; i < n; i++) {
        if(ok[ab[i]] && !out[ab[i]]){
            std::cout << ab[i] << std::endl;
            ok[ab[i]] = false;
        }
    }
    
}