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

namespace programPractice
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = Int32.Parse(Console.ReadLine());
            string[] str = new string[n];

            for (int i = 0; i < n; i++)
            {
                str[i] = Console.ReadLine();
            }
            for (int i = 0; i < n; i++)
            {
                Console.Write(str[i]);
            }
        }
    }
}