class A:
    def process(self):
        return "A"

class B(A):
    def process(self):
        return f"B -> {super().process()}"

class C(A):
    def process(self):
        return f"C -> {super().process()}"

class D(B, C):
    def process(self):
        return f"D -> {super().process()}"

obj = D()
print(obj.process())