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: ['699', 'd', '6027', 'j', 'e', 'c', 't', '9983', '5471', '2649', 't', '2631', 'r', 'h', '293', 'j', '8699', 'p', 'k', '5433']
Example Output: c, d, e, h, j, k, p, r, t

Example Input: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']
Example Output: b, d, f, i, k, q, s, v, w

Example Input: ['n', '3711', 'k', '4499', '2133', 'r', 'u', 'f', '4261', 'n', 'g', 'n', '7109', 'f', '8795', '705', 'x', '8853', 'j', 'w', 't', 'w', '8363', '3355', '4565', '5131', '1323', '3963', '8057', 'p', 'x']
Example Output:
f, g, j, k, n, p, r, t, u, w, x