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("");
