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]: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']
[A]: d, f, i, m, x


[Q]: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
[A]: a, j, l, q, y, z


[Q]: ['713', 'c', 'f', 'y', 'j', '1685', 'l', 'k', 'g', '2857', '2237', 'h', '6383', '1317', 'e', 'h', 'd', 't', '3703', '461', 'l']
[A]:
c, d, e, f, g, h, j, k, l, t, y