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: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']

A: b, d, i, p, r, t, u, v, w, y, z
****
Q: ['d', 'm', 'k', '3513', '8241', '5541', 'm', 's', '1993', '6163', '2753', 'd', 'b', 'm', 'i', '7647', '8631', '9119', '2165', 'x', '3911', '2769', '1673', '7195', 't', 'w', '5555', 'o', '3265']

A: b, d, i, k, m, o, s, t, w, x
****
Q: ['1445', '3813', '2299', 'd', 'm', 'c', '9031', 'b', 'e', 'j', '9741', '8185', '5513', '6549', '4775', '227', '6113', '8857', 'n', '5039', '4237', 'n', '1691', 'q', '4377']

A:
b, c, d, e, j, m, n, q
****