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.

[EX Q]: ['i', 'h', '8299', 'e', 'c', '5543', '5241', 'f', '3985', 'f', 'z', '1245', 'e', 't', 'g', '5199', '9217', 'q', 'j', 'p', '767', 'z', '1803', 'k', '7303', '3187', '2507', '6471', '3337', '6037', '9291', 'a', 'l']
[EX A]: a, c, e, f, g, h, i, j, k, l, p, q, t, z

[EX Q]: ['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']
[EX A]: a, d, g, w

[EX Q]: ['9749', 'z', 'y', 'j', 't', 'v', 'h', '8133', '1243', 'j', 'd', 'w', '3957', 'f', '6599', 'j', '8413', '4673', '5591', 'x', 'u', 'y', 'q', '2075', 't', '3615', 'l', '4695', '6763', '695', '3651', 'j', '961', 'f', 'q']
[EX A]:
d, f, h, j, l, q, t, u, v, w, x, y, z