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]: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']
[A]: a, h, m, n, p, s, v, w, y


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


[Q]: ['z', '9007', 'n', 'v', 'h', '3207', '9133', 'm', '1593', '8531', '4659', '2955', '7589']
[A]:
h, m, n, v, z