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.

Ex Input:
['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']

Ex Output:
a, c, e, h, j, k, o, s, v, w, x, z


Ex Input:
['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']

Ex Output:
h, o, s, v, w, y


Ex Input:
['g', 's', 'o', '2089', 's', 'a', '2009', 'w', '9861', '5685', '8575', 'j', 'a', '1857', 'o', 'o', 's', 't', '1817', 'f', 'd', '9837', 'z', 'k', 'a', '227', '8739']

Ex Output:

a, d, f, g, j, k, o, s, t, w, z