class Book:
    def __init__(self, title, pages=50):
        self.title = title
        self.pages = pages

class EBook:
    def __init__(self, title, pages=50):
        self.title = title
        self.pages = pages

def leaf_over(book : Book):
    for page in range(1, book.pages+1):
        print(book.title, "Page:", page)

B = Book("Balkan", 10)
E = EBook("Expert", 3)

leaf_over(B)
leaf_over(E)