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.

[Q]: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']
[A]: d, e, g, l, m, o, p, q, s, t, v


[Q]: ['6249', '1235']
[A]: -1


[Q]: ['5291', '2299', 'v', '3197', '6073', '8947', 'w', '2603', '9713', 'w', 'u', 'd', '99', '1839', '2857', '795', 'l', '2331', '9349', 's', 'o', 'y', 'a', 't', 's', '3447', 'h', 't', 'l', '2937', 'i', 't', 'v', 'm', '2359', '8119', '4263', 'p', '6591', 'l', 'd', '5653', '2795', '687']
[A]:
a, d, h, i, l, m, o, p, s, t, u, v, w, y