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:['4363', 'c', '9245', 'w', 'm', '1823', '3413', 'q', '5145', 'a', '8037', '6791', '4297', '7265', '5069']
Solution:
a, c, m, q, w