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:
['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']

Ex Output:
b, c, e, g, h, o, p, q, v, x, y, z


Ex Input:
['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']

Ex Output:
g, i, l, m, o, r, s, y


Ex Input:
['381', '4639', '6801', 'u', '4727', '713', 'v', '4425', 'x', 'u', '6395', 'y', '125', 'l', 'c', '3563', 'z', 'a', 'x', '9911', '4937', '9857', 'r', '101', '4555', '7883', '1791', 'e', '8149', '2301', '91']

Ex Output:

a, c, e, l, r, u, v, x, y, z