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: ['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']

A: a, b, d, e, j, k, m, n, o, p, q, u, v, w, x
****
Q: ['1595', '2915', 'o', 't', 'c', 'h', '3969', '5407']

A: c, h, o, t
****
Q: ['y', 'q', '3045', 'p', 'y', 'g', '4477', '1733', '9105', 'a', '1253', 'd', '5051']

A:
a, d, g, p, q, y
****