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]: ['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']
[EX A]: d, e

[EX Q]: ['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']
[EX A]: h, o, s, v, w, y

[EX Q]: ['g', '9157', 'e', '8341', 'x', 'v', '5261', '8417', '4633', '717', 'u', '8881', '5111', 'i', '2119', 'p', 'z', 'a', 'g', 'j', '1199', 'm', '8621', 'z', 't', 'g', '1715', 'd', 'k', 'y', '5791', 'i', 's', '7253', '159', 'v', '6419', '5951', 'k', 'i', 'c', '553', '9017', 'z']
[EX A]:
a, c, d, e, g, i, j, k, m, p, s, t, u, v, x, y, z