public static void Main()
Console.WriteLine("Kelas" + b + ".D" + "\t" + "Kelas" + b + ".C" + "\t" + "Kelas" + b + ".B" + "\t" + "Kelas" + b + ".A");
Console.WriteLine("Kelas" + a + ".D" + "\t" + "Kelas" + a + ".C" + "\t" + "Kelas" + a + ".B" + "\t" + "Kelas" + a + ".A");