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]: ['9783', '3185', '8225', 'u', '1123', 'd', '3453', 'i', '7713', '8457', '8609', 'h', '2767', 'e', '7191', '2929', '1089', '393', 'e', 'd', '11', '9329', '683', '1271']
[A]: d, e, h, i, u


[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']
[A]: a, b, c, h, j, m, n, p, t, u, y


[Q]: ['g', '6343', 'g', 'r', 'f', 'k', '2657', '797', 'a', 't', 'k', 'r', 'f', '9625', '9103', '4233', '4915', 'r', 'e', 'b', 'a', '8283', 'i', '6989', '3695', '1845']
[A]:
a, b, e, f, g, i, k, r, t