Write a Python program to implement the New User Registration: i. Prompt the user, who is doing registration, for entering a username and check its validity. ii. A valid username must be a string of length 8-12 and consists of: – at least 3 and at most 8 letters (a-z, A-Z) – at least 2 and at most 6 digits (0-9) – at most 1 underscore (_) iii. Prompt the user for entering a password and check its validity. iv. A valid password must be a string of length 10-16 and consist of: – at lea