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.

Example Input: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']
Example Output: a, h, m, n, p, s, v, w, y

Example Input: ['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']
Example Output: a, c, e, h, j, k, o, s, v, w, x, z

Example Input: ['l', 'c', '6321', 'o', 'b', 'w', '5639', '5531', '3627', '4815', 'p', 'q', '9053', 'k']
Example Output:
b, c, k, l, o, p, q, w