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]: ['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']
[EX A]: d, e, f, h, i, k, m, n, q, r, s, t, z

[EX Q]: ['3411', 'a', 'v', 'j', '8925', '909', 'h', 'l', 'r', '1371', 'u', '7789', '4813', 'u', 'q', 'i', '8473', 'n', '7191', 'c', '4641', 'e', '5107', 'q', 'z', 't', '105', 'q']
[EX A]: a, c, e, h, i, j, l, n, q, r, t, u, v, z

[EX Q]: ['x', '4053', 'z', '4225', 'e', '1463', 'c', 's', 'h', '8553', '4135', '9741', '409', '1119', '7327', 'x', '4141', '8707', '9771', 'g', 'z', '6423', 'e', 'b', '9489', 'd', '2017', '2909', '5815', '9163', 'd', '2791', '6317', 'e', '1641', 'f']
[EX A]:
b, c, d, e, f, g, h, s, x, z