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', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
Example Output: g, n, q, w, z

Example Input: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']
Example Output: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z

Example Input: ['a', '7167', '1881', 'j', '7799', 'i', '2657', '7691', '4735', 'i', 'g', '277', 'c', 'h', '9403', '1121', '9657', 'd']
Example Output:
a, c, d, g, h, i, j