using System;

public class Program

{

    public static void Main()

    {

        int x = 0;

            do

            {

                if (x % 2 == 0)

                {

                    for (int y = 0; y < 8; y++)

                    {

                        if (y % 2 == 0)

                        {

                            Console.Write("X");

                        }

                        else

                        {

                            Console.Write("O");

                        }

                    }

                }

                else

                {

                    for (int y = 0; y < 8; y++)

                    {

                        if (y % 2 == 0)

                        {

                            Console.Write("O");

                        }

                        else

                        {

                            Console.Write("X");

                        }

                    }

                }

                x++;

                Console.WriteLine();

            } while (x < 8);

    }

}