using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoder_597 {
    class Program {
        static void Main(string[] args) {
            int n = int.Parse(Console.ReadLine());
            string[] s = new string[n];
            for (int i = 0; i < n; i++) {
                s[i] = Console.ReadLine();
            }
            for(int i = 0; i < n; i++) {
                Console.Write(s[i]);
            }
            Console.ReadLine();
        }
    }
}