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.

['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']
a, c, e, h, i, o, p, s, u, w, x, z

['8879', 'x', '1383', '4925', '2867', 'j', 't', 'e', 'w', 'p', 't', 'w', 'l', '7447', '1877', '7747', 'k', 'b', 'x', '8565', 'q', '8575', '5711', '2949', '5637', '2197', '4905']
b, e, j, k, l, p, q, t, w, x

['7155', 'b', 'o', 'd', '7543', '4707', 'y', 'd', '9883', '5675', '4225', '4489', '6755', 'o', '135', 'i', 'x', 'e', '1867', '9353', '6937', 'h', '7651', 'f', 'i', 'w', '5199', '3317', 's']

b, d, e, f, h, i, o, s, w, x, y