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: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']

A: a, c, i, j, n, r, t, v, x
****
Q: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']

A: a, d, h, i, j, m, n, p, y
****
Q: ['2525', '5545', 'g', '651', 'j', '553', 'p', 'k', '6207', '9315', 'a', 'k', '1627', 'd', '495']

A:
a, d, g, j, k, p
****