class Pet:
    def __init__(self,name,age):
        self.name = name
        self.age = age

    def show(self):
        print(f"I am {self.name} and I am {self.age} years old")

    def speak(self):
        print('I do not know what I say')

class Cat(Pet):
    def __init__(self, name, age, color):
        super().__init__(name, age)
        self.color = color

    def speak(self):
        print("miaou")

    def show(self):
        print(f"I am {self.name} and I am {self.age} years old and I'm {self.color}")

class Dog(Pet):
    def speak(self):
        print("bark")

class Fish(Pet):
    pass

p = Pet('Tim', 19)
p.show()
c = Cat('Billy', 34, 'blue')
c.show()
c.speak()
d = Dog('Jill', 25)
d.show()
d.speak()
f = Fish('Tonton', 14)
f.speak()