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: ['1595', '2915', 'o', 't', 'c', 'h', '3969', '5407']
Example Output: c, h, o, t

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

Example Input: ['f', 's', 'w', '3219', 'y']
Example Output:
f, s, w, y