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:['7841', '2755', '8709', '1715', 'e', 'd', '6523', '6975', 'h', 's', 'x', 'k', '9837', 'u', 's', '3485', 'v', '6063', '611', '8037', '5201', 'j', '4405']
Solution:
d, e, h, j, k, s, u, v, x