Detailed Instructions: 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.
Q: ['m', 's', '8515', 's', 'j', '3771', 'o', 'f', '3257', '4857', '4411', '5869', '6741', '8151', '2023', '6039']
A:
f, j, m, o, s