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]: ['2527', '9123', '8717']
[A]: -1


[Q]: ['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']
[A]: a, c, e, h, j, k, o, s, v, w, x, z


[Q]: ['4001', '9929', 'p', '5747', '8641', 'k', '7173', 'b', '7213', 'a', 'd', '2805', '3951', '2059', '3921', '4671', '7589', '459', '2427', '2697', '869', 'l', 'u', '9209', '8949', 'w', 'b', '8227', '2735', 'w', '3813']
[A]:
a, b, d, k, l, p, u, w