for (int y = 1; y <= 7; y++)
            {
                for (int x = 1; x <= 7; x++)
                {
                    if (( x == y) || ( x+y == 8))
                    {
                        Console.Write('o');
                    }
                    else
                    {
                        Console.Write('.');
                    }   
                }
                Console.WriteLine();
            
            }