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.

['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']
d, e, h, i, m, n, v, z

['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']
a, b, c, e, f, g, j, l, o, q, s, t, u, w, y

['8895', 'm', '305', '1135', 'd', '107', '5301', '7855', 'h', '5733', '7879', '6829', 'l', '5033', 'v', 'f', '1857', 'g', 'z', 'v', 'n', 'k', 'a', '113', 'j', '4099', 'u', '9157']

a, d, f, g, h, j, k, l, m, n, u, v, z