text: """
      # All classes should extend Pizza.
  """
  class Pizza :
      def __init__(self):
          self.name = None
          self.dough = None
          self.sauce = None
          self.toppings = None
          self.toppings = []
  
      def prepare(self) :
          print('Preparing {}'.format(self.name))
  
      def bake(self) :
          print('Baking {}'.format(self.name))
  
      def cut(self) :
          print('Cutting {}'.format(self.name))
  
      def box(self) :
          print('Boxing {}'.format(self.name))
  
      def __str__(self):
          result = "---- {} ----\n".format(self.name)
          result += ('{}\n'.format(self.dough))
          result += ('{}\n'.format(self.sauce))
          for topping in self.toppings :
              result += ('{}\n'.format(topping))
          return result
  
  class CheesePizza(Pizza) :
      def __init__(self):
          super().__init__()
          self.name = "Cheese Pizza"
          self.dough = "Regular Crust"
          self.sauce = "Marinara Pizza Sauce"
          self.toppings.append("Fresh Mozzarella")
          self.toppings.append("Parmesan")
  
  class ClamPizza(Pizza) :
      def __init__(self):
          super().__init__()
          self.name = "Clam Pizza"
          self.dough = "Thin crust"
          self.sauce = "White garlic sauce"
          self.toppings.append("Clams")
          self.toppings.append("Grated parmesan cheese")
  
  class PepperoniPizza(Pizza) :
      def __init__(self):
          super().__init__()
          self.name = "Pepperoni Pizza"
          self.dough = "Crust"
          self.sauce = "Marinara sauce"
          self.toppings.add("Sliced Pepperoni")
          self.toppings.add("Sliced Onion")
          self.toppings.add("Grated parmesan cheese")
  
  class VeggiePizza(Pizza) :
      def __init__(self):
          super().__init__()
          self.name = "Veggie Pizza"
          self.dough = "Crust"
          self.sauce = "Marinara sauce"
          self.toppings.append("Shredded mozzarella")
          self.toppings.append("Grated parmesan")
          self.toppings.append("Diced onion")
          self.toppings.append("Sliced mushrooms")
          self.toppings.append("Sliced red pepper")
          self.toppings.append("Sliced black olives")