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: ['n', 'q', '6461', 's', '8565', '2237', '2071', '8143', '2977', '5511', 'j', 'o', '5793', 'j', 'm', 'n', '8031', 'j', '535', '5001', 's', 'y', '1737']
Example Output: j, m, n, o, q, s, y

Example Input: ['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']
Example Output: b, e, n, t, y

Example Input: ['q', '1961', 's', 'n', '4769', 'l', '8605', 'w', '4225', '8007', 'x', '2981']
Example Output:
l, n, q, s, w, x