#include <bits/stdc++.h>
#include <iostream>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>b; i--)
#define tobirep(i,a,b,c) for(LL i = a;i<b; i+=c)
#define tobirrep(i,a,b,c) for(LL i = a;i>b; i-=c)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9223372036854775807
#define tii -9223372036854775808
typedef long long LL;
int main(){
   ios::sync_with_stdio(0);cin.tie(nullptr);
  LL n;
  cin >> n;
  vector<string> p(n);
  map<string,bool> gg;
  rep(i,0,n){
    string a,b;
    cin >> a >> b;
    p[i]=b;
    gg[a]=true;
  }
  rep(i,0,n){
   if(gg[p[i]]==false){
     cout << p[i] << endl;
     gg[p[i]]=true;
   }
  }
    
    
    
    
}