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: ['d', '4377', '9271', '8053', '9519']

A: d
****
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: ['y', 'z', '613', 't', '9713', '5485', 's', '3639', 'z', 'z', '6607', 'd', 'i', 'f', '1999', '4529', '2089', '7877', '7607', 'y', '157', '1317', 'y', 'm', 'l', 'n', 'k', '2975', '847', '2845', 'b', '9085', '3591', 'x', '1599', 's', '8055', 'h', '2903', 'v', '4765', 'h']

A:
b, d, f, h, i, k, l, m, n, s, t, v, x, y, z
****