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: ['5075', '9169', '4659', '7605']
Example Output: -1

Example Input: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
Example Output: a, f, q, v, x

Example Input: ['l', '7457', 'd', '4189', '8437', 'f', 'j', 'u', '4621', 'y', 'd']
Example Output:
d, f, j, l, u, y