using System;

​

public class Program

{

    public static void Main()

    {

        /*

        int v = 0;

        Console.WriteLine("Input: ");

        string kata = Console.ReadLine();

        for (int i = 0; i < kata.Length; i++)

        {

            for (int b = i + 1; b < kata.Length; b++)

            {

                if (kata[i] == kata[b])

                {

                    v++;

                }

            }

        }

​

        if(v > 0)

        {

            Console.WriteLine("Not Isogram");

        }

        else

        {

            Console.WriteLine("Isogram");

        }

​

        int x = 0;

        Console.WriteLine("Input\nN: ");

        int en = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("String: ");

        string set = Console.ReadLine();

        for (int i = 0; i < set.Length; i++)

        {

            if (x <= set.Length - en)

            {

                Console.WriteLine(set.Substring(x, en));

            }

            x++;

        }

        */

        Console.WriteLine("Input: ");

        string en =Console.ReadLine();

        for (int i = 0; i <= en.Length; i = i+3)

        {

            Console.WriteLine(en.Substring(i, 3));  

        }

​

    }

}