Detailed Instructions: In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.
Q: ['8223', 'e', 'r', '1343', '8777', 'u', '1633', 'z', 'x', 'f', 'w', '9071', 'c', '5227', '4675', 'i', '3615', '1275', '891', 'h', '9679', 'w']
A:
c, e, f, h, i, r, u, w, x, z