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]: ['5499', 'm', '327', 'h', '5765', '4231', 'y', 'g', 's', '883', '9843', '2751', '8967', 'z', '2301', 'l', 'l', 'k', '7843', '7221', '3643', 'k', '5951', 'r', '9441', '235', '3835', 'l', 'e', 'y', '4061', 'l', '1177']
[A]: e, g, h, k, l, m, r, s, y, z


[Q]: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']
[A]: d, f, g, i, k, t, v, w


[Q]: ['q', 'm', 'w', 'w', 'q', 'i', '5125', 's', 'u', '6191', '1735', '9037', 'i', '8567', 'o', 's']
[A]:
i, m, o, q, s, u, w