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: ['u', 'd', '4193', '5687', 'p', 'r', '7787', 't']
Example Output: d, p, r, t, u

Example Input: ['6495', '2259', '8213', 'm', 'y', '3377', 'q', 'i', '1299', 's', 'w', '4331', 'h', '5459', '4059', '6637', '8069', '5367', '6025', 'l', 'v', '4503', 'd', 'x', 'w', '5067', '9019', 'd', '7919', '7299', 'v', '8957', 'v', '5341', '2617', '8169', 'n', 'y']
Example Output: d, h, i, l, m, n, q, s, v, w, x, y

Example Input: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
Example Output:
a, h, o, p, y