Books

The digital revolution has knocked at the doors of the grand library. They are transitioning from conventional books to e-books. The cataloging system is managed by a Python program using a Book class which stores attributes like title, author, and publication_year.

Your task is to create a subclass named EBook, which inherits from the Book class. The EBook class should have additional attributes like file_size (in MB) and format (like 'PDF', 'EPUB', 'MOBI', etc.).

The Book class includes a __str__() method that returns a string including the title, author, and publication_year in the format: "Title: {title}, Author: {author}, Published: {publication_year}". You should override this __str__() method in the EBook class to return a string that includes the title, author, publication_year, file_size, and format in the following format: "Title: {title}, Author: {author}, Published: {publication_year}, Size: {file_size} MB, Format: {format}".

Input	Output
`book = Book('To Kill a Mockingbird', 'Harper Lee', 1960); ebook = EBook('The Great Gatsby', 'F. Scott Fitzgerald', 1925, 1.5, 'PDF'); print(book); print(ebook)`	Title: To Kill a Mockingbird, Author: Harper Lee, Published: 1960 Title: The Great Gatsby, Author: F. Scott Fitzgerald, Published: 1925, Size: 1.5 MB, Format: PDF

Constraints

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