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.
Problem:['d', 'u', 'l', 'k', 'j', 'o', '7925', '9857', 'x', '8757', '3991', '6263', 'k', '1465', '2557', '9047', '2639', 'd', '8625', 'r', 'h', '7257', 'n']
Solution:
d, h, j, k, l, n, o, r, u, x