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]: ['g', '8591', '4463', '2189', '7901', '1457', 'f', 'i', '9031', 'r', '5519', '3955', 'd', '2093', 'c', 'y', '6591', '6463', 'h', '4371', '111', 'p', '3221', '4185', 'p', '8761', 'w', 'p']
[A]: c, d, f, g, h, i, p, r, w, y


[Q]: ['a', 'i', '7725', '2483', 'e', 'j', '5337', 'b', '6835', '8231', 'm', 'v', 'a', '1475', 'n', '5823', 's', 'm', '7313', '2841', '2585', '4673', 'u', '2083', 'z', 'd', 'p', '2117', 'i', '587', 'i', 'a', '2527', '7967', '6567', 'n', '6145', 'r', 'f']
[A]: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z


[Q]: ['q', 'y', 'x', '9599', '2871', 'b', 'x', 'm', '61', 'u', '3331', '5341', 'j', 'w', '3199', '3037', '8547', 'p', '5205', 'u', 'h', '6431', '8719', '2723', '1671', 'h', 'x', '1317', '6727', '2001', 'f', '3471', 'y', 'y', '497', 'z', 'v', '2999', 'j', 'v']
[A]:
b, f, h, j, m, p, q, u, v, w, x, y, z