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]: ['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
[A]: g, n, q, w, z


[Q]: ['q', 'i', 'a', 'n', '9095', 'v', 'u', 's', 'x', 'f', '4659', '155', 's', 'q', 'k', '8591', 'g', '2707', '4041', '8227', '7591', 'f', 'j', '1063', '1949', 'w', 'x', '2475']
[A]:
a, f, g, i, j, k, n, q, s, u, v, w, x