using System;

public class Program

{

    public static void Main()

    {

        bool? isDeleted = false;

        CheckDeleted(isDeleted);

        isDeleted = true;

        CheckDeleted(isDeleted);

        isDeleted = null;

        CheckDeleted(isDeleted);

    }

    public static void CheckDeleted(bool? isDeleted)

    {

        if (isDeleted == true)

            Console.Write("TRUE");

        if (isDeleted == false)

            Console.Write("FALSE");

        if (isDeleted == null)

            Console.Write("NULL");

    }

}