using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            const int SIZE = 8;

            //go through rows
            for (int i = 0; i < SIZE; i++)
            {
                //go through columns
                for (int j = 0; j < SIZE; j++)
                {
                    //alternate X's and O's
                    if (i % 2 == j % 2) Console.Write("X");
                    else Console.Write("O");
                }

                //end the row
                Console.WriteLine();
            }

            //wait for user response to kill program
            Console.ReadKey();
        }
    }
}