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: ['6709', 't', 'n', 'k', '991', 'a', '8899', '3563', '527', 'm', '4599', '6679', 'm', 'x', 'f', 'o', '3275', 'x', '677', 'b', '3329', '3593', '5183', '5753', 'u', '6045', '2607', 'y', '9873']
Example Output: a, b, f, k, m, n, o, t, u, x, y

Example Input: ['d', 'p', 'k', '9679', 'x', 'j', '7481', '1815', 't', 'w', '6513', 'j', '5079', '5219', 'p', '9545', 'a', '1931', '9973', '8125', '5169', '2791', 't', 'd', '2057', 'e', 'x', 'y', '7409', 'u']
Example Output: a, d, e, j, k, p, t, u, w, x, y

Example Input: ['u', '941', '5475', 'z', '749', 's', '2343', '6379', '9073', '6515', 'i', 'o', 's', '6763', 'v', '805', 'k', 'a', 'z', 'j', 'v', 'b', '7529', 'z', '8531', '2083', '1557', 'd', '2723', '9867', 'w', '9709', '9713', 'z', '9079', 'd', 'q', '2877', 'g', '6503']
Example Output:
a, b, d, g, i, j, k, o, q, s, u, v, w, z