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.

['w', 'i', '4383', '7667', '9617', 'y', 'a', '8051', 'w', '4857', 'y', '3953', 'u', 'o', 'y', 'i', '9201', 'g', '1807', '5367', 'g', '5263', '3995', '6665', '3113', '9433', '6315', 'm', '845', 'x', 'c', 'v', 'h', '1491', 'g', '3519', 'x', 'b', '7695']
a, b, c, g, h, i, m, o, u, v, w, x, y

['m', '8127', '7519', '4543', '2809', '9855', 'n', '6241', 'w', 'w', 'q', 'w', 'p', '8599', '7819', '3817', 'm', 'q']
m, n, p, q, w

['v', '7427', 'z', '4095', '8041', 'e', '4259', '3877', 'a', 'c', 'm', '4041', '2613', '3265', 'x', 'g', 'k', 'i', '6217', 'z', '9909', 'v', 'g', '9311', '5017', '1443', 'p', 'v', '4421', '2529', 'z', 'd', 'h', '8411', '9135', '8143', '5801', 'm']

a, c, d, e, g, h, i, k, m, p, v, x, z