#include <iostream>
#include <set>
#include <vector>
using namespace std;
int main(){
  int n;cin>>n;
  set<string> s1;
  vector<string> s2;
  set<string> sa;
  for(int i = 0; n > i; i++){
    string a,b;cin>>a>>b;
    s1.insert(a);
    s2.push_back(b);
    sa.insert(a);
    sa.insert(b);
  }
  set<string> z;
  for(int i = 0; s2.size() > i; i++){
    if(s1.find(s2[i]) == s1.end() && z.find(s2[i]) == z.end()){
      cout << s2[i] << endl;
      z.insert(s2[i]);
    }
  }
}