Validate the domain

Given a webpage domain like www.profound.academy or google.com or www.brilliant.org, your task is to validate it. Make sure that the domain is actually written correctly. The rules of a domain name:

  • It can start with www. or it can have nothing in the beginning

  • It should have a name that only has Latin letters (like profound or google)

  • It should end with any of .com, .org, or .academy

The input contains a single string - the domain.

The program should print Valid in case the domain is valid and Invalid in case it isn’t.

Input

Output

profound.academy

Valid

google.co

Invalid

w.google.com

Invalid

www.google.com

Valid

Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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