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]: ['3147', '9807', '5313', '6311', '737', '1555', '5803', '3437', '5665', '3973', 'o', 'f', '7871', '1721', '7833', '2933', 'b', 'b', 'n', 'm', 'k']
[A]: b, f, k, m, n, o


[Q]: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']
[A]: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


[Q]: ['8361', 'b', 'c', '9327', '1821', 'q', '7647', '6747', 'i', 'g', 'h', '7037', 'm', 'a', 'l', 'g', '6725', '6961', 'z', '9443', 'g', '8399', '8373', 'v', 'u', '6819', '8085', '9239', 'w', 'i', '761', 'd', '2289', 'v', 'y', 'u', 'g', 'd', 'w']
[A]:
a, b, c, d, g, h, i, l, m, q, u, v, w, y, z