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:
['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']

Ex Output:
b, e, l, m


Ex Input:
['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']

Ex Output:
e, f, i, j, r, s, u, v, w


Ex Input:
['a', '1415', 'm', 'j', '7237', 'd', 'w', '3281', '3203', '3587', 'r', '8561', '3311', '6289', '7675', '4189', 'u', 'w', 'g', 'g', 'i', 'k', '1241', '2985', '5671', '9617', 'a', 'q', 'f', '6923', '7227', 's', 'e', '9741']

Ex Output:

a, d, e, f, g, i, j, k, m, q, r, s, u, w