Q: 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.
['l', '419', '5993', 'b', '7595', 'g', 'j', '4437', 'q', 'k', 'q', 'w', '2835', '7121', 'u', 'i', 'c', '3827', 'r', 'v', '8025', '653', 'f', '2507', 'p', 'o', '6669', '2295', 'p', '787', '7089', 'g', 'z', '1163', '5881', 'z', '8335']
A:
b, c, f, g, i, j, k, l, o, p, q, r, u, v, w, z