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]: ['1121', 'j', '1433', 'g', 'l', '1479', '1699', 'j', 'a', '8507', 'd', 'a', '5229', 'k', 'x', '4549', 'e', 'p', '1367', 'u', 'd', '785', '215', 'e', 'f', 'a', '101', '7575', '7965', 'p', 'i', '5637', '1005', 'i', 'y', '181', 'r']
[A]: a, d, e, f, g, i, j, k, l, p, r, u, x, y


[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']
[A]: d, e, f, h, i, k, m, n, q, r, s, t, z


[Q]: ['6951', 'r', 'k', 'o', 'a', '5075', 'h', '3249', 'e', '1563', '2947', 'a', 'b', 'v', '8995', 'f', 'w', 'w', '929', '8857', 'q', '2125', 'h', 'e', '2237']
[A]:
a, b, e, f, h, k, o, q, r, v, w