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: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']
Example Output: b, l, r, v, y

Example Input: ['k', 'c', 'i']
Example Output: c, i, k

Example Input: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']
Example Output:
e, k, l, m, n, v, z