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.

['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
c, f, j, k, o, y

['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
d, e, h, i, l, m, o, p, q, r, v

['5139', '4145', '6059', '8001', '7793', 'a', 'n', '287', 'm', 'v', '8871', 't', 'b', '6183', 'u', 'e', 'b', '8955', '4757', 'b', 'p', '6399', 'c', '2975', '2881', 'g', '8283', 'f', '7361', 'w', 'p', '7627', 'x', '7329', '9807', '2829', 'r', 'f', '2379', '369', 'm', '8885', 'i', 'm']

a, b, c, e, f, g, i, m, n, p, r, t, u, v, w, x