task_4.py
# https://ru.stackoverflow.com/questions/736522/%D0%9F%D0%B5%D1%80%D0%B5%D0%B4%D0%B0%D1%82%D1%8C-%D0%B0%D1%80%D0%B3%D1%83%D0%BC%D0%B5%D0%BD%D1%82-%D0%B2-%D0%B4%D0%B5%D0%BA%D0%BE%D1%80%D0%B0%D1%82%D0%BE%D1%80
return None
return
return