text: class Book:
      def __init__(self, title, author):
          self.title = title
          self.author = author
  
  
  class ReaderBookStatus:
      def __init__(self, book):
          self.book = book
          self.page = 0
  
      def turn_page(self, page):
          self.page = page
  
  
  class Library:
      def __init__(self, books):
          self.books = books
  
      def add_book(self, book):
          self.books.append(book)
  
      def find_book(self, book):
          if book not in self.books:
              return "Book not found in the Library"
          return book.title
  
  
  Library.add_book = lambda self, book: self.books.append(book)
  
  book = Book('Philosopher\'s stone', 'J.K.Rowling')
  
  peshoInstance = ReaderBookStatus(book)
  goshoInstance = ReaderBookStatus(book)
  