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.

['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']
e, i, n, r, t, z

['z', 'h', '2065', '6773', 'v', '151', '8957', 't', 'l', 'j', '7867', 'v', '799', '9009', '4317', 'm', '6921', 'r', '1245', '5637', 'x', '4465', 'f', 'y', '3549', 'e', 'f', 'm', 't', '6281', '4241', '3415', 'z', 'g']
e, f, g, h, j, l, m, r, t, v, x, y, z

['6745', 'q', '883', 'n', 'e', '4167', '6191', 'e', 's', 'x', '9369', 'v', 'o', 'f', '6307', '1737', 'j', '8329', 'w', '3237', '5505', 'y', 'g', '9729']

e, f, g, j, n, o, q, s, v, w, x, y