#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
#include<map>
#include<stack>
#include<queue>
using namespace std;
int mod = 1e9+7;

int main() {
  int n; cin >> n;

  for(int i=0; i<n; i++){
    string c; cin >> c;
    cout << c;
  }
  cout << endl;

  return 0;
}

// EOF