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', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
[A]: a, b, c, i, k, l, m, p, q, s, u, x


[Q]: ['9223', 'w', '8631', '4453', '9975', 'y', '9747', 'g', '7077', '2593', '6015', 'n', '7345', 'i', '7807', '299', 'q', '3629', '2545', 'k', 'm', 'q', '5155', '5633', 'x', 'q', 'i', '27', 'f', '7919', 'p', '4835']
[A]: f, g, i, k, m, n, p, q, w, x, y


[Q]: ['b', 'n', 'q', 'z', 'j', '6509', 'x', 'r', 'w', '1009', '6271', '6583', '517', 'v', 'y', 'v', 'p', '4941', '655', '3385', 'i', '8237', 'a', '69', '8101', '8145', '7517', 'y', '9299', '7335', '1661', 'k', '9097', 's', '8987', 'g']
[A]:
a, b, g, i, j, k, n, p, q, r, s, v, w, x, y, z