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: ['8879', 'x', '1383', '4925', '2867', 'j', 't', 'e', 'w', 'p', 't', 'w', 'l', '7447', '1877', '7747', 'k', 'b', 'x', '8565', 'q', '8575', '5711', '2949', '5637', '2197', '4905']
Example Output: b, e, j, k, l, p, q, t, w, x

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

Example Input: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
Example Output:
c, h, l, u, x