Get the first half of the string stored in the variable called phrase

Доброе!

Начинаю изучать python. Не могу понять одну задачу:

len() function is used to count how many characters long a string is.
Get the first half of the string stored in the variable called phrase. Remember about string slicing

Код:

phrase = """
It is a really long string
triple-quoted strings are used
to define multi-line strings
"""
first_half = type here
print(first_half)

Куда копать?