using System;
 
namespace chess
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Char[,] board = new Char[8,8];
			for (int i = 0; i < 7; i++) {
				Console.WriteLine (i);
				for (int j = 0; j < 7; i++) {
					if (i % 2 == 0 && j % 2 == 0) {
						board [i, j] = 'X';
					} else {
						board [i, j] = 'O';
					}
				}
			}
			for (int x = 0; x < 8; x++) {
				for (int k = 0; k < 8; k++) {
					Console.Write(board[x, k]);
				}
				Console.Write("\n");
			}
		}
	}
}
 

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