#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)
int main(){
  int N;
  cin >> N;
  rep(i,0,N - 1){
    string s;
    cin >> s;
    cout << s;
  }
  cout << endl;
}