using System;

public class Program

{

    public static void Main()

    {

         int a, b, c;

        c=1;

        for(a=1;a<=8;a++)

        {

            for(b=1;b<=8;b++)

            {

                if(c==1)

                {

                     Console.Write("X");

                }

                else

                {

                    Console.Write("O");

                }

                c*=-1;

            }

            if(2%2==0)

            {

                c*=-1;

            }

             Console.WriteLine("");

        }

    Console.WriteLine();    

    }

}

​

​