using System;

public class Program

{

    public static void Main()

    {

        var a = new AnotherClass<ClassC>();

        var c = new AmazingClass<InterfaceC>();

        Console.WriteLine("Worked");

    }

    class ClassA {}

    class ClassB {}

    class ClassC : ClassA {}

    class AmazingClass<T> where T : InterfaceA {}

    class AnotherClass<T> where T: ClassA {}

    interface InterfaceA {}

    interface InterfaceB {}

    interface InterfaceC : InterfaceA{}

}