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:
['8235', 't', '1695', '9899', '3633', 't', '1823', 'r', 'x']

Ex Output:
r, t, x


Ex Input:
['2883', 'a', 'f', 'z', '233', 'n', '289', '2987', '5565', 'c', '7095', 'y', 'a', '6451', 'c', '993', '7599', '9907', 'q', 'y', '5073', '8125', 't', '2219']

Ex Output:

a, c, f, n, q, t, y, z