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:
['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

Ex Output:
a, b, c, d, e, g, h, q, u, w, y, z


Ex Input:
['w', 'i', '4383', '7667', '9617', 'y', 'a', '8051', 'w', '4857', 'y', '3953', 'u', 'o', 'y', 'i', '9201', 'g', '1807', '5367', 'g', '5263', '3995', '6665', '3113', '9433', '6315', 'm', '845', 'x', 'c', 'v', 'h', '1491', 'g', '3519', 'x', 'b', '7695']

Ex Output:
a, b, c, g, h, i, m, o, u, v, w, x, y


Ex Input:
['e', '303', 'e', 'z', '8341', 'l', 'q', 'f', 'n', '5945', 't', 'v', 'z', '9941', 'c', '2723', '7243', '4987', 'b', 't', '9467', '7695', 's', '1679', 'l', 'f', 's', '6401', 'p', '5059', 'w', '1121']

Ex Output:

b, c, e, f, l, n, p, q, s, t, v, w, z