WIkipedia pages have a specific webpage address. Any address starts with https://en.wikipedia.org/wiki/ and then continues with the topic for that page e.g. Computer_science, Java_(programming_language). See examples below:

https://en.wikipedia.org/wiki/Computer_science

https://en.wikipedia.org/wiki/Java_(programming_language)

https://en.wikipedia.org/wiki/Imagine_Dragons

Write a program that reads a string from the user. If it is a valid wikipedia webpage, it extracts and prints the topic for that page. If it is not a valid address it prints the message Not a valid wikipedia webpage address. Hint: How can the fact that all valid addresses start with the same text before the topic name help you extract the topic name? You do NOT need to handle the case where the webpage address is correct, but it is written in uppercase letters. You can assume it is all lowercase.

the text is all in lowercase and

if the address is valid, then it will have at least one more character for the topic. That is, you do not need to handle an input like: https://en.wikipedia.org/wiki/.

---- Sample run 1

This program will extract the topic from a valid Wikipedia webpage address.

Enter a web address: https://en.wikipedia.org/wiki/Computer_science

Topic: Computer_science

Bye.

---- Sample run 2

This program will extract the topic from a valid Wikipedia webpage address.

Enter a web address: http://vlm1.uta.edu/~alex/courses/1310/homework/hw02.html

Not a valid wikipedia webpage address.

Bye.

---- Sample run 3

This program will extract the topic from a valid Wikipedia webpage address.

Enter a web address: https://en.wikipedia.org/wiki/

Topic:

Bye.