#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
using namespace std;

int main(){
  int n;cin >> n;
  string a[n+1],b[n+1];rep(i,n)cin >> a[i] >> b[i];
  map<string,int> m;
  rep(i,n){m[a[i]] += 1;}
  rep(i,n)if(m[b[i]] == 0){cout << b[i] << endl;m[b[i]] = 1;}
  return 0;
}