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.

['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']
d, e

['8311', 'w', 'f', '3431', '9863', '5817', '3969', '2705', 'x', 'm', 'k', 'z', 'z', '235', 'x', '417', 's', 'i', 'y', '8833', '8675', 's', 'm', '2149', '765', 'u', '1021', '7823', 'x', '7275', '3157', 'k']
f, i, k, m, s, u, w, x, y, z

['2661', '4539', '2633', 'j', '4159', 'p', '4419', 't', 'j', '13', '4747', '8309', 'a', '6045', '1883', 'l', '5651', '9689', '8013', 'o', 'r', 'k']

a, j, k, l, o, p, r, t