#include <set>
#include <vector>
#include <iostream>
using namespace std;

int main() {
    int n; cin >> n;
    vector<string> A, B;
    set<string> ok;
    while (n--) {
        string a, b; cin >> a >> b;
        A.push_back(a); B.push_back(b);
        ok.insert(b);
    }
    for (string &a : A) ok.erase(a);
    for (string &b : B)
        if (ok.find(b) != ok.end()) {
            cout << b << endl;
            ok.erase(b);
        }
}