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

int main() {
  int n;
  cin >> n;
  vector<string> ok;
  set<string> ng;
  for (int i = 0; i < n; ++i) { 
    string a, b;
    cin >> a >> b;
    // cerr << a << " " << b << endl;
    ng.insert(a);
    ok.push_back(b);
  }
  for (string &b: ok) { 
    if (ng.find(b) != ng.end()) continue;
    ng.insert(b);
    cout << b << endl;
  }
}