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]: ['g', '7517', '3173', 'd', '2143', 'n', '8507', 'l', '8369', '225', 'e', 'l', '9511', 'p', '1317', '5651', 'p', '1125', 't', '739', '6453', 'l', 'g', '8555', '8075', 'x', 's', 'd']
[EX A]: d, e, g, l, n, p, s, t, x

[EX Q]: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
[EX A]: d, e, h, i, l, m, o, p, q, r, v

[EX Q]: ['8037', 'd', '4009', 'h', 'p', '5097', '6795', '7199', '7819', '1833', 'i', '7573', 'd', '3729']
[EX A]:
d, h, i, p