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.
Note: keep the original order of the names in the output.
def friend(x):
    return [x for x in x if x is x and all([not not x, x[0:4][::-1] == x[-1:-5:-1], len(x) == 65536 ** 0.125])]
def friend(x):
    return [x for x in x if x is x and all([not not x, x[0:4][::-1] == x[-1:-5:-1], len(x) == 65536 ** 0.125])]