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]: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']
[A]: a, h, m, n, p, s, v, w, y


[Q]: ['2943', 'k', '8519', '9103', 'j', '2461', '1049', '2211', '8761', 'l', 'e', '8939', '6013', 'r', '9089', '5781', '5383', '5495', '6699', '7307', '2733', '933', '9865', 'g', '6471', '3179', 'm', '8231', 't', 'e', 'u', '9909', 'g', 'g', '9431', '6521', 'y', 'g', '1415', 'e']
[A]: e, g, j, k, l, m, r, t, u, y


[Q]: ['1107', '5449', 'n', 'e', '5177', 'y', 'v', '1219', 's', '103', 'u', '221', 'y', 'j', '2911', '7745', 's', '7591', '8999', 'v', '9941', '3979', '4775', '4895', 'g', '6887', '4981', '5397', '2571', '4521', '2781', 'y', '6989', '7881', '3499', 'n', '6907', '5583', 'j', '4999', '289', '3655']
[A]:
e, g, j, n, s, u, v, y