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.

['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']
c, e, f, h, j, l, n, p, q, s, v, w, x

['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
b, c, d, e, g, j, k, n, o, p, q, r, s, t, v

['2979', '2049', 'b', '769', 'n', 'k', 'm', 'h', 'y', 'k', '285', '8515', 'c', '6639', 'n', 'j', 'n', 'l', '4621', '683', '7635', 'f', '2533', '6457', 'i', 'x', 'h', '6133', 'i', 'e', '1601', 'b', '6889', 'm', 'h', '1647']

b, c, e, f, h, i, j, k, l, m, n, x, y