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]: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']
[A]: c, j, q, v


[Q]: ['n', 'y', '7087', '9539', 'x', 'i', 'w', '7237', '8613', 'k', '5999', '4179', 'o', 'm', '7485', '1955', 'w', '1451', 'h']
[A]: h, i, k, m, n, o, w, x, y


[Q]: ['9451', '3735', '9605', 'v', '5355', 'n', 'k', 'f', '6745', 'e', '749', '8973', 'x', '8265', '2867', 'n', 'j', '8597', '6061', 'v', '1655', '4859', 'f', 't', '6571', 'z', '6075', '8907', 'm', '6281', '6277', '9961', 'd']
[A]:
d, e, f, j, k, m, n, t, v, x, z