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: ['t', 't', 'p', '3245', 'x', 'g', 'i', 'u', '2599', '8613', 't', 'v', 'p', '5635', 'y', '9567', '5193', '8617', 'q', 'f']
Example Output: f, g, i, p, q, t, u, v, x, y

Example Input: ['8685', '3989', '3637', 'x', 'k', '9025', '3427', '5513', '3909', 'n', 'p', '2049', 'i', '15', '4037', '1929', 'i', '3877', 'd', '5661', '5293', 's', 'd', 'p', '925', '5993', '9819', '2083', '5437', '4431', '8277', 'v', 'h', 'y', 'd', '7943', 't']
Example Output:
d, h, i, k, n, p, s, t, v, x, y