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]: ['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']
[A]: a, e, h, l, n, o, q, u, v, y


[Q]: ['5539', '8541', 'k', 'c', 'e', 'j', 'x', '2015', '2551', 'h', 'j', '2705', 'p', 'p', 'k', 'h', 'v', '4991', '1247', 'b', '187', '4853', 'l', 'y', 'd', '4975', 'y', '3113', 'q', 's', 'y', 'o', 'w', '761', '8073', 'q']
[A]:
b, c, d, e, h, j, k, l, o, p, q, s, v, w, x, y