Your task is very simple. Given an input string s, case\_sensitive(s), check whether all letters are lowercase or not. Return True/False and a list of all the entries that are not lowercase in order of their appearance in s.
For example, case\_sensitive('codewars') returns [True, []], but case\_sensitive('codeWaRs') returns [False, ['W', 'R']].
Goodluck :)
Have a look at my other katas!
Alphabetically ordered 
Find Nearest square number 
Not prime numbers
def case_sensitive(s):
    l = [x for x in s if x.isupper()]
    return [l == [], l]
def case_sensitive(s):
    l = [x for x in s if x.isupper()]
    return [l == [], l]