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]: ['4417', 'x', '4641', '885', '8485', 'd', '7057', '8519', 'm', 'i', 'l', '4627', '3069', 'v', '5011', 'u', '6673', 'h', '4541', 'j', '2337', '8175', '4797', 'f', '9109', 'q', 'q']
[A]: d, f, h, i, j, l, m, q, u, v, x


[Q]: ['887', 'p', '3819', '2727', '1407', 'b', 'n', '737', 'd', 'w', 'q', '6877']
[A]: b, d, n, p, q, w


[Q]: ['8739', 'u', '3043', '8555', '1503', 'r', '7655', 'j', '5837', 'q', '3397', 'j']
[A]:
j, q, r, u