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]: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']
[A]: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z


[Q]: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']
[A]: e, f, l, n, p, q, r, s, w, y


[Q]: ['8527', '9017', 'y', 'q', '2047', '4539', 'u', 'v', '7619', '4915', 'u', '1553', '161', '6879', '3899', '8229', 'h', 'a', 'w', 'i', '1527', '1845', 'i', 'j', '5803', '2935', '7643', '1319', 'r', '9141', '2031', '1221', 'z', 'w', 'y', 'y', '8267', 'd']
[A]:
a, d, h, i, j, q, r, u, v, w, y, z