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', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
Example Output: c, h, l, u, x

Example Input: ['6585', 'i', 'p', '5623', '3557', '8011', 'c', '6389', 'h', 'h', 'd', '1823', '5567', 'v', 'p', 'x', 'c', '2161', '3649', 'o', '6227', 'f', '9975', 'd', 'm', '2587', 'o', 't', 'k', '7637', 'm', 'l']
Example Output: c, d, f, h, i, k, l, m, o, p, t, v, x

Example Input: ['5799', '2505', '1197', '7585', '5923']
Example Output:
-1