import datetime

t = datetime.time(19)


def greeting(name: str) -> str:
    if datetime.time(6) <= t < datetime.time(11):
        return f'Доброе утро, {name}!'
    if datetime.time(11) <= t < datetime.time(18):
        return f'Добрый день, {name}!'
    if datetime.time(18) <= t < datetime.time(21):
        return f'Добрый вечер, {name}!'
    if datetime.time(21) <= t < datetime.time(6):
        return f'Добрый вечер, {name}1'

print(greeting("Иван"))