#include <bits/stdc++.h>
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
using Int = long long;
const char newl = '\n';

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  Int n;
  cin>>n;
  vector<string> as(n),bs(n);
  for(Int i=0;i<n;i++) cin>>as[i]>>bs[i];

  set<string> uku;
  for(Int i=0;i<n;i++) uku.emplace(as[i]);
  for(Int i=0;i<n;i++){
    if(!uku.count(bs[i])) cout<<bs[i]<<newl;
    uku.emplace(bs[i]);
  }

  return 0;
}