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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