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.

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

Example Input: ['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']
Example Output: b, h, n, u

Example Input: ['s', 's', 'w', '9587', 's', '3149', '4697', '1761', '6697', 'x', '7571', 'b', '1005', '9335', '2797', '367', 'k', '9157', '5637']
Example Output:
b, k, s, w, x