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: ['2819', 'k', 'u', 'a', '4575', 'a', 't', 'a', 'f', '1507', '415', 'w', 'o', 'o']

A: a, f, k, o, t, u, w
****
Q: ['8381', 'j', '761', '5431', '7601', 'd', '4339', '1479', 'b', 'x', 'f', 'w', '2437', '7725', '6385', '411', 'w', 'w', 'i', '2769', '5709', '5703', 'k', '5301', '6503', '7833', 'y', '3813', '7061', '5531', 'n', '2251', 'y', '8941', '8481', 's', 't', 't', '3345', 'k', '1545']

A: b, d, f, i, j, k, n, s, t, w, x, y
****
Q: ['8129', 'i', 'p', 'u', 'w', 'm', '5585', 'q', 'o', 'm', '9173', '5855', '1335', 'j', '9361', 'k', 'o', '7189', 'a', 'm']

A:
a, i, j, k, m, o, p, q, u, w
****