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 Input:
['a', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']

Ex Output:
a, b, c, d, e, j, k, l, n, o, p, r, y, z


Ex Input:
['g', '8591', '4463', '2189', '7901', '1457', 'f', 'i', '9031', 'r', '5519', '3955', 'd', '2093', 'c', 'y', '6591', '6463', 'h', '4371', '111', 'p', '3221', '4185', 'p', '8761', 'w', 'p']

Ex Output:
c, d, f, g, h, i, p, r, w, y


Ex Input:
['t', 'j', 'x', '8857', 'j', 'p', '21', '8159', '8139', '4755', '6507', 'n', '1199', '491', '2715', 'j', '2597', '503', 'd', '2569', '3299', 'f', '2697', '381']

Ex Output:

d, f, j, n, p, t, x