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:
['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:
['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']

Ex Output:
a, b, d, e, j, k, m, n, o, p, q, u, v, w, x


Ex Input:
['a', '2755', '1695', '8571', '4589', '1543', '4707', '4679', '5093', '3043', '1585', 'w', 'm', '1275', 'y', 'n', 'b', 'a', '809', 'b', '4585', '7087', '7385', 'x', 'k', 'c', '7885']

Ex Output:

a, b, c, k, m, n, w, x, y