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: ['4857', 'z', '313', '7813', '9935', 'o', 'w', 'i', 'x', 'o', 'e', 's', 'a', 'p', 'i', 'v', 'x', '6743', 'p', '435', 'u', 'a', 'h', '607', '2491', '6159', 'u', '7761', '6197', '3449', '3459', 'e', 'g', '8731', '335', '2883', '3941', 'n', '1881', 'y', 'j', '8189', 'k', '7593', '2747']
Example Output: a, e, g, h, i, j, k, n, o, p, s, u, v, w, x, y, z

Example Input: ['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']
Example Output: g, h, k, m, n, q, t, u, v, w, x

Example Input: ['s', 'h', 'l', 'w', '7537', '6701', 'n', '9221', 'f', '9555', 'b', '8491', 'x', '765', '8325', 't', '2417', '8563', '2823', 'z', 'r', '6905', '3643', 'q', '1745', '7003', '2501', '8149', 'l', '4889', '3767', '8243', 'h', 'e']
Example Output:
b, e, f, h, l, n, q, r, s, t, w, x, z