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.

['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']
h, o, s, v, w, y

['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']
b, h, i, m, r, u, y, z

['c', 'n', 'm', 'a', 'h', 's', '3857', 'h', 'c', 'p', '781', '247', '2609', '9049', 't', '3739', 'k', '5671', 'f', '2863', '7733', 'r', 'x', 'y', 'q', '8629', '1517', '2239', 'w', '147', 's', 'y', '5125']

a, c, f, h, k, m, n, p, q, r, s, t, w, x, y