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]: ['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']
[A]: b, e, f, i, k, l, m, o, p, q, r, t, v, w, y


[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]: ['d', '257', 'c', 'l', '5249', 'd', 'v', '8499', 'p', '5589', '6665', 'm', 'h', 'c', '9825', 'g', '907', 'h', 'f', '463', '5187', 'b', '9343', 'e', '9239', 'n', 'u', 'g', 'x']
[A]:
b, c, d, e, f, g, h, l, m, n, p, u, v, x