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: ['3127', '9253', '5667', '9453']
Example Output: -1

Example Input: ['c', '8389', 'j', '6113', '5843', 'f']
Example Output: c, f, j

Example Input: ['z', 'y', 'x', '6819', 'k', '6807', 'v', '9987', '5801', '4265', 'a', 'y', '4085', 'v', 'l', '6443', 'n', '797', 'p', 'h', '3727']
Example Output:
a, h, k, l, n, p, v, x, y, z