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: ['2165', 'f', '5081', 's']

A: f, s
****
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: ['887', '5647', '9617', 'd', 'p', '3067', '5313', '9187', 'q', 'x', '3491', 'w', 'r', '8419', 'e', 'w', '2437', '5425', 'w']

A:
d, e, p, q, r, w, x
****