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: ['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']
Example Output: e, l

Example Input: ['v', 'l', 'v', '7673', '8975', 'u', '2471', '4151', '3615', '1139', 'i', 'z', '8833', 'v', '341', 'l', 'n', 'l', 'd', '9207', '1861', '3901', 'a']
Example Output: a, d, i, l, n, u, v, z

Example Input: ['1165', '9297', '7503', '3263', 'q', '3829', '5307', '5755', 'w', 'o', '8083', '3371', 'c', '2233', '1695', 'l', '9921']
Example Output:
c, l, o, q, w