using System;

public class Program

{

    public static char a1 = '-';

    public static char a2 = '-';

    public static char a3 = '-';

    public static char b1 = '-';

    public static char b2 = '-';

    public static char b3 = '-';

    public static char c1 = '-';

    public static char c2 = '-';

    public static char c3 = '-';

    public static string cordinates;

    public static void Main()

    {

        if (cordinates == "a1")

        {

            a1 = 'x';

        }

        if (cordinates == "a2")

        {

            a2 = 'x';

        }

        if (cordinates == "a3")

        {

            a3 = 'x';

        }

        Board();

    }

    public static void Board()

    {

        Console.WriteLine(" {0} | {1} | {2} ", a1, a2, a3);

        Console.WriteLine("-----------");

        Console.WriteLine(" {0} | {1} | {2} ", b1, b2, b3);

        Console.WriteLine("-----------");

        Console.WriteLine(" {0} | {1} | {2} ", c1, c2, c3);

        cordinates = Console.ReadLine();

    }

}