import re

def valid_username(username):
    if username[0].isdigit():
        return False
    if len(username) > 15:
        return False
    return True

usernames_input = input("Enter usernames separated by commas: ")

usernames = usernames_input.split(',')

for username in usernames:
    username = username.strip()  
    print(f"Username: {username} -> Valid")

Enter usernames separated by commas:  jerin,dass


Username: jerin -> Valid
Username: dass -> Valid