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from abc import ABC, abstractmethod

class PaymentMethod(ABC):
    @abstractmethod
    def pay(self): pass

class CardPayment(PaymentMethod):
    def pay(self): print("Оплата картой")

class CashPayment(PaymentMethod):
    def pay(self): print("Оплата наличными")

class QRPayment(PaymentMethod):
    def pay(self): print("Оплата по QR")