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]: ['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']
[A]: d, g, h, k, l, m, n, q, t


[Q]: ['y', 'b', 'r', 'f', '3745', 'n', '2921', '8133', 'r']
[A]: b, f, n, r, y


[Q]: ['w', '7807', '6097', 'p', 'i', 'l', 'x', 'j', '7009', 'd', '9257', '4275', 'x', 'b', 'v', 'r', 'e', 'j', 'l', 'j', '9025', '7261', '2601', 'h', 'n', '5009', 'i', '8851']
[A]:
b, d, e, h, i, j, l, n, p, r, v, w, x