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]: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
[EX A]: d, e, k, q, s, u, w

[EX Q]: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']
[EX A]: e, f, l, n, p, q, r, s, w, y

[EX Q]: ['v', 'd', '6305', '6813', '6063', 'e', '457', 's', 'c', 'e', '6327', '2707', '7101', 'g', '265', '2815', 'b', 'c', 'o', '8191', '2835', 'j', 'z', '9393', '1571', '1897', 'o', 'c', '3931', 'u', '1033', '189', '4937', 's', 'm', '3173', 't', 'y', 'y', 'h', '1467', '5739', 'l', 'u']
[EX A]:
b, c, d, e, g, h, j, l, m, o, s, t, u, v, y, z