#include <bits/stdc++.h>   using namespace std;   void c_p_c() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);   }   int32_t main() {     c_p_c();     long long n;     string s[222222];     map<string, bool> check;     cin >> n;     for (long long i = 1; i <= n; i++) {       cin >> ws;       getline(cin, s[i]);     }     for (long long i = n; i >= 1; i--) {       if (!check[s[i]]) {         check[s[i]] = 1;         cout << s[i] <<   n ;       }     }     return 0;   }   