how to search for a capital letter within a string and return the list of words with and without capital letters

My homework assignment is to Write a program that reads a string from the user and creates a list of words from the input.Create two lists, one containing the words that contain at least one upper-case letter and one of the words that don't contain any upper-case letters. Use a single for loop to print out the words with upper-case letters in them, followed by the words with no upper-case letters in them, one word per line.

What I know is not correct:

s= input("Enter your string: ")
words = sorted(s.strip().split())
for word in words:
    print (word)

Because it only sorts the sequence if the Capitol is in the first character. For this assignment a character could appear any where within a word. Such as, 'tHis is a sTring'.

I was playing around with a solution that looked similar to this, just to see if I could get the words with CAPS out..But it just wasnt working:

    s = input("Please enter a sentence: ")
while True:
    cap = 0
    s = s.strip().split()
    for c in s:
        if c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
            print(c[:cap])
            cap += 1
    else:
        print("not the answer")
        break 

But a regular expression would probably do a better job than writing out the whole alphabet.

Any help is much appreciated. Needless to say I am new to python.