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.

Example Input: ['p', '4329', '2437', '6279', 'u', '459', 'f', 'c', 'i', 'w', 'n', 't', '429', 'n', '73', '4995', 'p', 'z', '8459', '6133', 'y', 'r', '4057', 'a', '2717', '7803', 'r', 'm', '2879', '6989', '7223', 'v', '7929']
Example Output: a, c, f, i, m, n, p, r, t, u, v, w, y, z

Example Input: ['g', '7517', '3173', 'd', '2143', 'n', '8507', 'l', '8369', '225', 'e', 'l', '9511', 'p', '1317', '5651', 'p', '1125', 't', '739', '6453', 'l', 'g', '8555', '8075', 'x', 's', 'd']
Example Output: d, e, g, l, n, p, s, t, x

Example Input: ['8857', 'k', '4297', '5291', 'o', 'e', 'y', '481', 'r', 'z', 'f', 'p', 'i', 'q', 't', 'z', 'h', '2593']
Example Output:
e, f, h, i, k, o, p, q, r, t, y, z