Q: 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.
['5079', 'e', 'u', '3625', '3573', '6187', 'y', '5095', 'q', '4599', 'g', '6419', 'm', 'y', '2277', 'g', 'y', 'p', 'w', '4585', 'm', 'a', '3529', 'v', 'k', 'b', '9575', '7949', '5065', 'x', '3971', 'z', '8785', '5057', 'd', '443']
A:
a, b, d, e, g, k, m, p, q, u, v, w, x, y, z