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:
['1189', '7143', '993', '1513', '6449', '9749', '5963', '8159', 't', '3543', 'j', 'i', '4227', '1463', '6431', '4987', 'y', 'q', 'f', '321', 'm', 'r']

Ex Output:
f, i, j, m, q, r, t, y


Ex Input:
['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']

Ex Output:
d, e


Ex Input:
['1093', 'd', '5347', 'o', 'x', 'n', '5141', 'v', 'c', 'y', '2217', '6761', 'r', '3881', '9297', 's', 'w', '7355', 'd', '3135', 'y', 'r', 's', '8621', '141', '2499', 'w', '4921', '7881', 'y', '7553', '8283', 'o', '1977', 'v', '5717']

Ex Output:

c, d, n, o, r, s, v, w, x, y