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: ['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']

A: a, b, d, e, j, k, m, n, o, p, q, u, v, w, x
****
Q: ['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']

A: c, e, j, l, n, q
****
Q: ['z', '7563', '4071', 'l', '5107', 'd', 'i', 'x', 'i', '8991', '7031', 'y', '3679', 's', '9007', 'g', 'k', '7207', '8611', 'w', '6155', '635', '2169', 'a', 'q', '637', 'i', '7587', 'k', 'd', 'p', 'v', 'a', '3765']

A:
a, d, g, i, k, l, p, q, s, v, w, x, y, z
****