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: ['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']

A: a, e, g, h, i, j, k, n, o, p, s, u, v, w, x, y, z
****
Q: ['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

A: f, h, i, l, o, q, r, t, u, v, x
****
Q: ['4239', '8901', '8579', 'z', '8457', 'g', '965', 'c', '761', '5885', 'h', 'p', '5985', '4881', 'v', 'i', '8785', '9011']

A:
c, g, h, i, p, v, z
****