class A is
	fun Foo() is
		Builtin.WriteLine("A.Foo()");
	end
end

class B : A is
	fun Foo() is
		Builtin.WriteLine("B.Foo()");
	end
end

class C : A is
end

class InheritanceDemo is
	fun Main() is
		var a : A;

		a = new A();
		a.Foo();

		a = new B();
		a.Foo();

		a = new C();
		a.Foo();
	end
end