using System;

public class Program

{

    public static void Main()

    {

        Azaza a = null;

        Console.WriteLine(a != null ? "a is not null" : "a is null");

    }

    public class Azaza

    {

        public static implicit operator Azaza(Hui hui)

        {

            Console.WriteLine("operator");

            hui.ToString();

            return new Azaza();

        }

    }

    public class Hui

    {}

}