#include <bits/stdc++.h>
using namespace std;
#define INF 1000000000
#define MOD 1000000007
#define FOR(i, a, b) for(int i = (int)(a); i < (int)(b); i++)
#define REP(i, b) FOR(i, 0, b)
#define ALL(x) (x).begin(),(x).end()
typedef long long ll;

int main() {
  int n;
  set<string> a;
  vector<string> b;
  cin >> n;
  REP(i, n) {
    string str;
    cin >> str;
    a.insert(str);
    cin >> str;
    if(find(ALL(b), str) == b.end()) {
      b.push_back(str);
    }
  }
  int size = b.size();
  REP(i, size) {
    if(find(ALL(a), b[i]) == a.end()) {
      cout << b[i] << endl;
    }
  }
}