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: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']
Example Output: a, j, r, z

Example Input: ['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
Example Output: a, d, f, h, i, j, o, r, u, v, w, y, z

Example Input: ['959', 'o', 'f', '2557', '1603', 'g', 'k', '4961', '2925', 'v', 'm', '7', '3793', 'a', '5485', 'v', '4583', '627', '6493', 'l', 's', 'i', 'f', 't', '1201', 'z', 'q', 'w', '8339', '3157', 'p', '2331', '9615', 'e', 's']
Example Output:
a, e, f, g, i, k, l, m, o, p, q, s, t, v, w, z