private static void WriteBoard(int size)
{
	for (int j1 = 0; j1 < size; j1++)
            {
                Console.WriteLine();
                if (j1 % 2 == 0)
                {
                    for (int j = 0; j < size / 2; j++)
                    {
                        Console.Write("#");
                        Console.Write(".");
                    }
                }
                else {
                    for (int l = 0; l < size / 2; l++)
                    {
                        Console.Write(".");
                        Console.Write("#");
                    }
                }
	         }
	Console.WriteLine();
}