#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;

int main(){
  int n;
  cin >> n;
  map<string, int> mp;
  vector<pair<string,string>> p;
  rep(i,n) {
    string a, b;
    cin >> a >> b;
    mp[a] = 1;
    if (!mp.count(b)) mp[b] = 0;
    pair<string,string> x = make_pair(a,b);
    p.emplace_back(x);
  }

  rep(i,n) {
    if (mp[p[i].second]) continue;
    cout << p[i].second << endl;
    mp[p[i].second]++;
  }

  return 0;
}