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 Q]: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']
[EX A]: e, g, h, i, p, r, y

[EX Q]: ['p', '5229', '7521', 'y', 'n', 'u', 'c', '4047', '781', 'a', '4707', '7149', 'j', 'm', 't', '515', '7691', 'h', '4879', 'j', '6593', 'n', 'p', '2949', '1343', 'y', '2629', 'p', 'b', 'b', '2861', 'a']
[EX A]: a, b, c, h, j, m, n, p, t, u, y

[EX Q]: ['h', 'l', 'k', '7361', '4477', '5781', '3261', '1583', 'e', '3457', 'y', '3293', '1211', 'a', '775', '587', 'a', 'c', '4051', 'w', '5911', '9255', 'v', 't', '4501', 'l', '3071', 'k', '3565', 'c', 'r', 'a', '8427', 'y', 'm', '5229', 'm', '999', '5671', '9343', 'o', '8977', '2309']
[EX A]:
a, c, e, h, k, l, m, o, r, t, v, w, y