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:
['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:
['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']

Ex Output:
b, d, i, p, r, t, u, v, w, y, z


Ex Input:
['r', '9491', 'c', '5099', '6749', '319', 'p', 'e', 'h', '6111', '9523', '1025', 'e', '5741', 'c', 'a', 'n', 'v', 'i', '9279', '8639', 'u', '5581', 'a', '6031', '69', '5135', 'g', '8625', 'w']

Ex Output:

a, c, e, g, h, i, n, p, r, u, v, w