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: ['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']
Example Output: p, q, y

Example Input: ['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']
Example Output: a, c, e, h, i, o, p, s, u, w, x, z

Example Input: ['371', '2133', 'y', '1479', 't', '9479', '6027', 'x', '5795', 'u', 'v', 'o', '2961', 'e', '6859', '2979']
Example Output:
e, o, t, u, v, x, y