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', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']
Example Output: a, c, d, j, l, m, n, o, p, r, t, v, w, x, z

Example Input: ['6769', '1057', '1021', 'n', '8231', '9173', '8123', 'a', '6053', 'q', 'y', '883', 'r', '1215', 'x', 'o', '9531']
Example Output: a, n, o, q, r, x, y

Example Input: ['h', 'c', 'k', 'w', 'o', '1435', '9461', 'g', '6001', 'i', '8249', '983', 'o', 'c', '3489', 'g', 'j', 'h', '4293', '1229', '5659', '5151', 'j', 'f', 'k']
Example Output:
c, f, g, h, i, j, k, o, w