kyu7_friend_or_foe.py

"""
Make a program that filters a list of strings and returns a list with only your friends name in it;

If a name has exactly 4 letters in it, you can be sure that it has to be a friend of yours! Otherwise, you can be sure
he's not...

Ex: Input = ["Ryan", "Kieran", "Jason", "Yous"], Output = ["Ryan", "Yous"]

i.e.
    friend ["Ryan", "Kieran", "Mark"] `shouldBe` ["Ryan", "Mark"]

Note: keep the original order of the names in the output;

https://www.codewars.com/kata/55b42574ff091733d900002f

"""


def friend(x):
    return [item for item in x if len(item) ==4]