Q: 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.
['2543', '6431', '4375', '677', '5565', '749', '3225', 't', 'z', '2819', 'o', '6857', '8743', 'q', 'j', '5043', '6143', 'p', '5301', 'q', '9425', 'o']
A:
j, o, p, q, t, z