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:
['f', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']

Ex Output:
a, c, f, g, h, m, n, s, w, 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:
['7285', '259', 'v', '9655', 'a', '4347', 'q', '9101', 'w', 't', '9203', '201', '2479', '2293', '2333', '8651', '1601', '569', '8919', 'x', 'm', '3209', '9117', '1455', '9681', 'j', 'x', '9391', 'h', 'x', '1859', 'o', '3073']

Ex Output:

a, h, j, m, o, q, t, v, w, x