using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace yukicore
{
    class Program
    {
        private static void Main()
        {
            //no597
            StringBuilder sb = new StringBuilder();
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i < n; i++)
                sb.Append(Console.ReadLine());
            Console.WriteLine(sb.ToString());
        }
    }
}