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', '7489', 'n', 'n', '9787', '7829', 'n', '3481', 'v', 'l', '8927', 'c', 'm', 'd']
Example Output: c, d, l, m, n, v

Example Input: ['d', '1989', '6365', 'y', 'm', '1245', '7539', 'm', '3787', '6987', 'e', 'e', 'y', '9577', 'b', '5', '8179', 'x', '2853', '6337', 'w', 'f', 'b', 'q', '563', '6077', '1133', 'x', '6045']
Example Output: b, d, e, f, m, q, w, x, y

Example Input: ['1157', 't', 'z', 'j', '3765', '1401', '1005', '4791', '5547', 'z', '3233', '6925', '8705', 'h', '519', 'j', '7577', '2923', 's', '1941', '4173', 'e', 't', 'c', 's', 'p', 'm', 'm', 'i', 'x', '2931', '1231', '7073', '3931', 't', 'k', '9433', '8647']
Example Output:
c, e, h, i, j, k, m, p, s, t, x, z