A company is validating usernames for its internal employee portal

Every employee enters their full name as a string like “john_123”

your job is to write a program that does the following:

1. Accept a string that represents a username

2. Check if the username (i) contains only lowercase letters, digits and underscores (ii) starts with a lowercase (iii) has no spaces or special symbols

3. If valid print “username accepted”, If not valid print a msg like

i) username must start with a lowercase letter

ii) username contains invalid character