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.

[EX Q]: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']
[EX A]: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z

[EX Q]: ['3583', 'd', '1481', 'w', 'l', '7261', '2933', 'n', '8725', 'g', '3441', 'r', '287', '7327', '5637', 'r', '5389', 'm', 'j', 'd', 'a', 'e', 'v', '7879', '1731', 'z', '43', 'q', 'p', '4315', 'p', '3651', 'o', 'l', 's', '9787', 'h', '6735']
[EX A]: a, d, e, g, h, j, l, m, n, o, p, q, r, s, v, w, z

[EX Q]: ['y', '559', '6157', '9159', '3699', '7413', 'l', 'x', '2545', '7599', 'k', 'i', '8799', '6919', 'l', '5509', 'r', 'l', '2075', '5387', 'm', 'a', 'i', 'd', 'u', 'f', 'm', 'o', 'i', 'y', '5623', '8961', '8947', 'j', '3271', '1083']
[EX A]:
a, d, f, i, j, k, l, m, o, r, u, x, y