#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;

  set<string> ng;
  vector<string> cand(n);
  
  REP (i, n) {
    string tmp;
    cin >> tmp >> cand[i];
    ng.insert(tmp);
  }

  REP (i, n) {
    if (!ng.count(cand[i])) {
      cout << cand[i] << endl;
      ng.insert(cand[i]);  // remove dupilicate
    }
  }
  
  return 0;
}