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.

[EX 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']
[EX A]: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z

[EX Q]: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']
[EX A]: c, j, q, v

[EX Q]: ['8247', '1307', '5201', '3931', 't', 'f', 'r', 'h', 'u', 'c', 'g', '651', '8267', '9265', '6073', 'f', 'u', 't', '8809', '2907', 'j', 's', 'o', '8991', 'p', '1399', 'i', '2201', '9089', '9071', '8807', 'w', 'l', '7807', 'v', 'u', '4343', 'g', 'r', 't', 'f', '9441']
[EX A]:
c, f, g, h, i, j, l, o, p, r, s, t, u, v, w