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: ['2165', 'f', '5081', 's']
Example Output: f, s

Example Input: ['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']
Example Output: a, b, e, g, l, n, q, u

Example Input: ['307', 'g', 'g', '2445', 'b', '5939', '2061', '6699', '3097', 'l', 'c', '1235', 's', 'z', 'r', 'r', '1359', '3367', '5359', '379', '5629', '5971', '5395', 'e', 'j', 'w', 'b', 'k', 'c', '233']
Example Output:
b, c, e, g, j, k, l, r, s, w, z