#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int N;
  cin >> N;
  vector<string> S;
  map<string, bool> mp;
  for (int i = 0; i < N; i++) {
    string a, b;
    cin >> a >> b;
    S.emplace_back(b);
    mp[a] = false;
    if (mp.find(b) == mp.end() || mp[b]) mp[b] = true;
  }
  for (auto s : S) {
    if (mp[s]) {
      cout << s << '\n';
      mp[s] = false;
    }
  }
  return 0;
}