Are all libraries restricted?

Tell us what’s happening:
It’s stated in the README.md “Do not import any Python libraries.”

Can I import “re”, used for regex?

import re

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36.

Challenge: Time Calculator

Link to the challenge:

Nevermind, I completed it without importing any libraries.