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]: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
[A]: h, p, r, u, z


[Q]: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']
[A]: e, f, j, n, p, r, w, z


[Q]: ['y', '8711', '6447', 'p', 't', 'd', 'z', '1421', 'c', '9567', '1377', '3071', 'u', '5001', '6231', '7793', 'q', 'b', '9629', '3829', 'o', '1895', '3315', 'e', 'c', '3513', '201', '9685', '2239', '2963', '4281', '4289', '435', 'e', 'b', 'v', 'v', 'z', '3153']
[A]:
b, c, d, e, o, p, q, t, u, v, y, z