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: ['o', 'm', '8015', '787', '4787', '1727', 'f', 'e', 'c']
Example Output: c, e, f, m, o

Example Input: ['n', 't', '2901', '9697', 'a', 'j', 'x', 'a', '4437', '2255', '2177', 's', '3173', 'j', 't', '5713', '4091', '4253', '5553', 'i', '4533', 'i', 'e', '6899', 's', '3541', '2139', '2705', 'm', 'u']
Example Output: a, e, i, j, m, n, s, t, u, x

Example Input: ['859', '7587', 'f', '6241', '9377', 'w', 'e', 'j', 'u', 'c', 'z', '8527', '2185', 'z', 't', 'h', '2587', 'n', '2421', '4121', '459', '4481', 'r', '3631', '7407', 'z', '4283', '175', 's', 'w', 'x', '6917', '5769', '7419', '7041', '1743', '9349', 't', 'o', 'k', '9313', 's']
Example Output:
c, e, f, h, j, k, n, o, r, s, t, u, w, x, z