#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <climits>
#include <cmath>
#include <algorithm>

#define TEST_ASSERT(msg, cond) do { if (cond) { cout << msg << " => pass" << endl;} else { cout << msg << " => failed" << endl;} } while(0)

using namespace std;

int main() {

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

  return 0;
}