using System;
class Program
{
    static void Main(string[] args)
    {
        int wordCount = int.Parse(Console.ReadLine()!);
        string connect = "";

        if (wordCount == 1)
        {
            string word = Console.ReadLine()!;
            Console.WriteLine(word);
            return;
        }

        for (int i = 0; i < wordCount; i++)
        {
            string word = Console.ReadLine()!;
            connect += word;
        }

        Console.WriteLine(connect);
    }
}