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]: ['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
[EX A]: g, n, q, w, z

[EX Q]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[EX A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v

[EX Q]: ['8091', 'u', 'd', 'd', '3395', 't', 'f', 'e', '5367', 'j', 'i', 'i', 'v', 'h', '2443', '3095', 'p', '897', 'l', '5527', '3521', 's', 'd', 'p', 'x', 'm', 'o', '8875', '2227', 'm', '3451', 'p', 's']
[EX A]:
d, e, f, h, i, j, l, m, o, p, s, t, u, v, x