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:
['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']

Ex Output:
b, c, d, e, g, j, k, n, o, p, q, r, s, t, v


Ex Input:
['9947', '3353', '8643', '4621', '4857', 'y', '7075', 'c', '8911']

Ex Output:
c, y


Ex Input:
['1585', 'a', '1083', '9919', '7025', 'l', '5211', 'v', 'u', 'a', 'u', 'z', 'k', 'a', '6627', '6759', 'y', 'y', '5517', 'r', 'j', '5041', '4229', 'h', '2433', '8273', '8271', 'q']

Ex Output:

a, h, j, k, l, q, r, u, v, y, z