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.
['s', 'g', '5039', '2373', '6853', 'a', 'v', '3027', '7213', 'f', 's', 'j', '3149', '2323', '5879', '4333', '3515', '287', 'c', '1929', '5363', '9135', '1013', '5485', '9983', '9263', 'j', '3011', '337', 'h', '4983', 'b', '7591', 'q', '2733', '3935', 'r']
A:
a, b, c, f, g, h, j, q, r, s, v