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]: ['1197', '305', 's', '1113', 'n', '2207', 'e', '227', '2833', '607', '3049', 'v', '4615', 'a', 'k', 'r', 's', '3571', 'f', '4215', 'f', '8985', '5559', '4111', 'u', '1433', '1943', '8831', 'w', 'x', 'o', '9023', 'u', 'y', 'p', 's', 'h', '8877', 'p', 'n', '8903', '5811']
[A]: a, e, f, h, k, n, o, p, r, s, u, v, w, x, y


[Q]: ['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']
[A]: a, b, c, d, f, h, i, j, k, p, q, t, w, y, z


[Q]: ['a', '9673', '6173', '5489', 'j', 'd', '6951', '4817', 'k', 'd', '9571', 'm', 'c', '2753', 'h', '775', '2795', 'b', '983', 'x', 'r']
[A]:
a, b, c, d, h, j, k, m, r, x