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.

[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']
[A]: d, e, h, i, l, m, o, p, q, r, v

[Q]: ['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']
[A]: c, e, h, k, p, q, u, v, y

[Q]: ['9247', 'o', '7017', '1203', '1021', 'c', '9319', '9553', '6495', 'b', '5423', 'o', 'j', '2793', '299', '1277', 'a', 'f', 'p', '2107', 'l', '1841', 'a', 'l', '1781', 'c', '1263', '6463', '1557', '4389', '8545', 'm', '1203', 'a', '9661', '9165', '9169']
[A]:
a, b, c, f, j, l, m, o, p