using System;

public class Program

{

    public static void Main()

    {

        string X="X";

        string O="O";

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

        {

            if(i%2==0)

            {

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

                {

                    if(j%2==0)

                    {

                        Console.Write(X);

                    }

                    else

                    {

                        Console.Write(O);

                    }

                }

                Console.WriteLine();

                Console.WriteLine("");

            }

            else

            {

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

                {

                    if(j%2==0)

                    {

                        Console.Write(O);

                    }

                    else

                    {

                        Console.Write(X);

                    }

                }

                Console.WriteLine();

                Console.WriteLine("");

            }

        }

    }

}