class AbstractShape(ABC):
    pass

class Circle(AbstractShape):
    pass

class Rectangle(AbstractShape):
    pass

circles = []
rectangle = []

class AbstractFactory(ABC):
    @abstractmethod
    def execute(shape: AbstractShape = None):
        pass

class AddFatory(ABC):
    def execute(shape: AbstractShape = None):
        global circles, rectangle
        if isinstance(shape, Circle):
            circles.append(Circle())

class RemoveFatory(ABC):
    def execute(shape: AbstractShape = None):
        global circles, rectangle

class UndoFatory(ABC):
    def execute(shape: AbstractShape = None):
        global circles, rectangle

class RedoFatory(ABC):
    def execute(shape: AbstractShape = None):
        global circles, rectangle

class PrintFatory(ABC):
    def execute(shape: AbstractShape = None):
        global circles, rectangle


action_user = input()

if action_user == 'Add':
    AddFatory().execute(shape)