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: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']
Example Output: a, b, e, h, j, k, n, o, t, u, v, y

Example Input: ['5453', 'f', '2475', '9863', 'b', 'k', 'm', '507', '8333', 'b', 'y', '3429', 'm', 'h', 'w', 'l', 'o', '7693', '2243', 'l', '1249', '7453', 'y', '3539', '6729']
Example Output:
b, f, h, k, l, m, o, w, y