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: ['491', '229', 'g', '6677', '4793', 'h', 'x', 'a', '2333', 'u', 'l', '785', 'p', '7331', '653', '5193', '5415', '8417', 'v']
Example Output: a, g, h, l, p, u, v, x

Example Input: ['a', '6927', '9843', 'w', 'e', 'w', 'q', 'x', 'e', '1319', '5217', 'g', '513', 'd', 'k', 'f', 'j', '4187', '4977', 'i', '2789', 'x', 'r', '9791', 't', 'k', '5985', '5535', 'a', 'a', '1775']
Example Output:
a, d, e, f, g, i, j, k, q, r, t, w, x