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]: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']
[A]: d, i, j, m, s, t, v, z


[Q]: ['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']
[A]: a, b, c, f, g, h, j, k, p, r, v, w, x, y


[Q]: ['o', 'r', '9531', '8707', 'o', '4833', '2345', '7047', 'b', '4925', '1789', 'e', '27', '7013', '9661', '7177', 'a', '1275', 'e', '1287', 'z', 'y', '2081', 'c', '773']
[A]:
a, b, c, e, o, r, y, z