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: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']
Example Output: c, j, q, v

Example Input: ['m', '7517', '9361', '9567', '8785', 'k', '5699', '3585', 'v', '1913', '1651', 'g', 'p', '2731', 'q', 'h', '467', 'r', '1091', '9801', 'a', '6645']
Example Output: a, g, h, k, m, p, q, r, v

Example Input: ['k', 'c', 'i']
Example Output:
c, i, k