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', 'l', 'i', '1507', 'h', '409', '6777', 'u', '5563', '6113', '6513', '9949', '461', 'z', 'm', '2519', 'r', '4699', 'n', 'x', '4645']
[A]: h, i, l, m, n, r, u, x, 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]: ['r', '7789', '6001', 's', 'j', 'p', 'x', '9137', 'f', '3125', '725', 'm', 'c', '2819', '9195', '1353', 'y', '9133', '8121', 'q', '5333', 'z', 'e', 'c', 'b', 'i', '1119', 'f', 'k', '503', 'c']
[A]:
b, c, e, f, i, j, k, m, p, q, r, s, x, y, z