using System;

public class Program

{

    public static void Main()

    {

        int angka = 3, a;

        string input;

        for ( ; ; )

        {

            Console.Write("Deret Hitung :");

            for (a=1; a<5;a++){

            Console.Write(angka +",");

            angka = angka + 4;

            }

            Console.WriteLine(".......=?");

            Console.WriteLine("Hitung Lagi? [Y/T]");

            input = Console.ReadLine();

            if (input == "Y" || input == "y" )

            {

                a = 0;  

            }

            else if ( input == "T" || input == "t" )

            {

                Console.WriteLine("Thank You!");

                break;

            }

            else {Console.WriteLine("Mohon Input Dengan Benar! Silahkan Restart Kembali!");

                break;} 

            }

    }

}