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]: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']
[EX A]: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z

[EX Q]: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']
[EX A]: d, e, f, j, k, r, u, v, w, x, z

[EX Q]: ['3173', 'h', '655', '8983', 'l', 'm', '9213', 'x', 'b', 'h', '4213', 't', 'z', '1109', 't', '7949', 'j', 'p', '417', '891', '551', 'y', 'z', 'd', 'j', 'p']
[EX A]:
b, d, h, j, l, m, p, t, x, y, z