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: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']
Example Output: c, j, q, v

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: ['6187', 'j', '2821', 's', 'v', 'm', '9549', 'l', '5911', 'l', 'l', '9503', 'o', '3017', '5877', 'k', '7223', '3621', 'i', '9831', 'k', '6795', 'u', '7549', '5977', 'k', '8569', '8467', 'f']
Example Output:
f, i, j, k, l, m, o, s, u, v