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.

['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']
c, e, j, l, n, q

['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']
a, c, e, f, l, r, t, y, z

['w', '1327', 'o', '9321', '6615', '9757', '8857', 'v', '8515', 'f', '4561', '9329', 'p', 'e', '2765', '3287', 'o', 'k', '9107', 'a', '5809', 'o', 'o', 'i', '1023', '7739', 't', 'y', '7895', '8081', '3887', '3159', '8263', '6497', '6093']

a, e, f, i, k, o, p, t, v, w, y