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]: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
[A]: h, p, r, u, z


[Q]: ['a', '533', '67', 'z', 'z', '9283', 'o', 'a', '7045', '1521', 'm', 'h', 'q', '4173', '7497', '319', '5721', '6097', 'i', '9829', '1801', '7347', 'r', 'z', '239', '4279', 'e', 'k', 'r', 'v', '6653', '599', '8597', 'd', 'r']
[A]: a, d, e, h, i, k, m, o, q, r, v, z


[Q]: ['2399', 'c', 'i', '5627', '4325', '7463', 'o', '9107', '71', '4919', 'q', '641', 'j', 'd', 'p', 'r', '1905', '6583', 'x', 'p', 'm']
[A]:
c, d, i, j, m, o, p, q, r, x