in Python. how would you go about this what is your thought process

2. unused(w1, w2, alphabet-printable[10:36]) Write a function unused(wl, w 2, alphabet-printable[ 10:36) that takes two words wl and w2 (le., strings composed of only the 26 lower-case alphabetic characters) and returns a tuple of lower-case characters that are in neither string (note: the expression printablel 10: 36| returns a string containing the 26 lower-case alphabetic characters from 'a'to , inclusive)