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', 'y', '7087', '9539', 'x', 'i', 'w', '7237', '8613', 'k', '5999', '4179', 'o', 'm', '7485', '1955', 'w', '1451', 'h']
Example Output: h, i, k, m, n, o, w, x, y

Example Input: ['2181', '7019', 'l', 'z', 'z', 'y', '1245', '4179', '6951', '7249', '2723']
Example Output: l, y, z

Example Input: ['8369', '7025', '6187', 'f', 'd', '3145', 'r', 'i', '2977', 'u', '167', 'o', '4711', '7431', '8445', '7263', 'a', '7343', '777', 'r', 'x', 'p', '4457', 'd', 's', 'o', '2381']
Example Output:
a, d, f, i, o, p, r, s, u, x