from abc import ABCMeta, abstractproperty

class ICar(metaclass=ABCMeta):
    @abstractproperty
    def description(self):
        pass
    
    @abstractproperty
    def cost(self):
        pass

class Economy(ICar):
    @property
    def description(self):
        return 'Economy'
    
    @property
    def cost(self):
        return 12000.00

class IDecorator(ICar):
    def __init__(self, car):
        self._car = car
        
    @property
    def car(self):
        return self._car

class V6(IDecorator):
    @property
    def description(self):
        return self.car.description + ', V6'
    
    @property
    def cost(self):
        return self.car.cost + 1200.00

class BlackPaint(IDecorator):
    @property
    def description(self):
        return self.car.description + ', Black Paint'
    
    @property
    def cost(self):
        return self.car.cost + 2000.00

class Vinyl(IDecorator):
    @property
    def description(self):
        return self.car.description + ', Vinyl Interior'
    
    @property
    def cost(self):
        return self.car.cost + 4000.00