Metaclass — Singleton Pattern

Implement a SingletonMeta metaclass so that any class using it as its metaclass can only ever have one instance.

class MyService(metaclass=SingletonMeta):
    pass

a = MyService()
b = MyService()
assert a is b  # same object

Implement solve() which:
1. Creates two instances of MyService.
2. Returns True if they are the same object (is), False otherwise.

Constraints

• Implement the singleton logic inside SingletonMeta.__call__.
• Do not modify MyService itself.