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: ['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']
Example Output: f, h, j, k, l, n, q, r, w, y

Example Input: ['9817', '2369', 'z', 'k', 'k', 'g', 'r', '739', 'i', '9929', '2047', '3859', '1221', 'n', 'n', 'o', '7773', 'z', '6181']
Example Output:
g, i, k, n, o, r, z