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]: ['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']
[EX A]: a, b, e, j, l, n, p, r, t, u, w, x, y, z

[EX Q]: ['l', 'u', '3901', '341', '5801']
[EX A]: l, u

[EX Q]: ['i', 'f', 'w', 'o', 't', 'k', 'd', 'd', 'n', 'l', '5351', '5861', '9777', '683', 'k', 'g', '8765', '5341', '4415', 't', 'a', '7421', 'r', 'h', '6417', '7745', 'y', 'q', '6515', '6437', 'h', '5615', '4521', 'o', '3061', '3733', 'f', '2823', 'h', '6845', 'j', 'j', 'f', 'e', '8989']
[EX A]:
a, d, e, f, g, h, i, j, k, l, n, o, q, r, t, w, y