using System;

​

public class TypeA

{

    public static implicit operator TypeB(TypeA b) => new TypeB();

}

​

public class TypeB

{

    public static implicit operator TypeA(TypeB b) => new TypeA();

}

​

public class Program

{

    public static void Main()

    {

        object a = new TypeA();

        Console.WriteLine(a);

        Console.WriteLine((TypeB)a);

        Console.WriteLine(a as TypeB);

    }

}