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]: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']
[A]: c, e, f, g, h, k, l, m, n, o, u, x, y, z


[Q]: ['6181', 'w', '4663', '5507', 'a', '6607', '869', '2669', 'r', '3629', 'r', 'l', '6599', '8885', 's', '4315', 'z', 'l', 'r', '1225', '8371', '1545', '7169', '1175', 'k', 'p', 'y', '7263', '5537', '8649', '3317', 'q', 'r', 'u', 'd', '4647', 'u', 'y', 'h', '9753', 'q', '725']
[A]: a, d, h, k, l, p, q, r, s, u, w, y, z


[Q]: ['n', 'w', 'z', 'q', '3485', 'a', 'x', 'u', 'z', 'm', '4417', 'b', '2099', 'i', '8043', '9117', '1157', '9157', '6723', '8843', 's', '8499', 'y', 'a', '6381', 'h']
[A]:
a, b, h, i, m, n, q, s, u, w, x, y, z