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]: ['w', '491', 'x', 'u', 'z', 'q', '5411', '7629', '8261', '8629', '1441', '5139', 's', 'm', '6463', 'u', 'z']
[A]: m, q, s, u, w, x, z


[Q]: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']
[A]: c, g, l, n, r, u, v, w, z


[Q]: ['k', '4239', 'h', '4539', 'o', 'm', '2165', 'd', 'n', '4333', 'f', '6911', 'y', 'e', '8193', '7231', '4075', 'e', '3927', 'b', '8527', '4453', 'c', '4323', '2535', 'q', '1399', 'l', 'x', '3761', '8817', 'x', '9199', 'a', '2503', 'q', 'i', 'i']
[A]:
a, b, c, d, e, f, h, i, k, l, m, n, o, q, x, y