using System;

public class Program

{

    public static void Main()

    {

           int a;

            a = 1;

            while (a <= 10)

            { if (a < 3)

                {Console.WriteLine("Kelas" + a + ".A \t" + "Kelas" + a + ".B \t" + "Kelas" + a + ".C \t" + "Kelas" + a + ".D"); a++;}

                else if (a == 3)

                {Console.WriteLine();a++;}

                else if (a <=9)

                { Console.WriteLine("Kelas" + a + ".D \t" + "Kelas" + a + ".C \t" + "Kelas" + a + ".B \t" + "Kelas" + a + ".A"); a++; }

                else 

                { Console.WriteLine("Kelas" + a + ".D\t" + "Kelas" + a + ".C\t" + "Kelas" + a + ".B\t" + "Kelas" + a + ".A"); a++;}

​

         }

    }

}