#include <bits/stdc++.h>

using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  freopen("B3.INP", "r", stdin);

  map<string, char> hash;

  int q;
  cin >> q;
  for (int i = 0; i < q; i++) {
    string a;
    cin >> a;
    // cout << a;
    if (hash.find(a) == hash.end()) {
      hash[a] = 1;
    } else {
      hash[a] = 0;
    }
  }

  for (const auto i : hash) {
    if (i.second == 1)
      cout << i.first << '\n';
  }
}