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]: ['6175', '9441', '7127', '5979', 's', '1367', 'e', 'm', '7083', '1787', '8375', '2851', '3475', 'r', '697', 'g', 'z', 'm', '4207', 'c', '7971', 'z', '9339', 'd', 's', '3507', '9003', 'i', 'y', 'w', 'j', 'i']
[EX A]: c, d, e, g, i, j, m, r, s, w, y, z

[EX Q]: ['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']
[EX A]: c, e, f, h, j, l, n, p, q, s, v, w, x

[EX Q]: ['d', '207', 'k', '4499', 'o', '4597', 't', '5561', 'c', 'q', '4097', '6657', '455', '7123', '2735', '7091', 'j', 'e', 't', '167', '2777', '5307', 'f', '6531', 'y', '5321', 'v', 's', 'q', '7203', '3907', 'w', '2823']
[EX A]:
c, d, e, f, j, k, o, q, s, t, v, w, y

