#include<iostream>
#include<string>
#include<vector>
#include<map>

using namespace std;

signed main(){
  map<string,int> s;
  vector<string> v;
  int n;

  cin>>n;

  for(int i = 0; i < n; i++){
    string a, b;

    cin>>a>>b;

    s[a]++;
    s[b];
    v.push_back(b);
  }

  for(int i = 0; i < v.size(); i++){
    if(!s[v[i]]){
      cout<<v[i]<<endl;
      s[v[i]] = 1;
    }
  }
  
  
  return 0;
}