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]: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
[A]: h, p, r, u, z


[Q]: ['6585', 'i', 'p', '5623', '3557', '8011', 'c', '6389', 'h', 'h', 'd', '1823', '5567', 'v', 'p', 'x', 'c', '2161', '3649', 'o', '6227', 'f', '9975', 'd', 'm', '2587', 'o', 't', 'k', '7637', 'm', 'l']
[A]: c, d, f, h, i, k, l, m, o, p, t, v, x


[Q]: ['2857', '6817', 'h', 'b', '3891', 'b', 'j', '5179', '9895', '57', 'f', '4187', 'o', '8615', '4439', '7523', '4197', '9861', 'd', '5087', '9771', 's', 'w', 'p', 'p', '5039', '4195', '907', 'x']
[A]:
b, d, f, h, j, o, p, s, w, x