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]: ['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']
[A]: a, d, h, k, o, p, r, t, x


[Q]: ['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']
[A]: a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z


[Q]: ['8535', 'j', 'k', '6919', '4741', 'i', '5651', 'a', '3133', 't', '419', 'k', 'o', '4143', '585', 'c', 't', '8649', 'd', '5443', 'k', 'a', '5133', 'f', 'a', 'n', '7631', 'n', '9955', '9399', '7969', '2855']
[A]:
a, c, d, f, i, j, k, n, o, t