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: ['j', '917', 'w', 't', '8873', '1431', '8059', '7041']
Example Output: j, t, w

Example Input: ['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']
Example Output: c, e, f, h, j, l, n, p, q, s, v, w, x

Example Input: ['709', 'm', 'a']
Example Output:
a, m