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:['i', 'j', 'm', '4411', '8899', '7951', '3419', '4645', '9429', 'z', '4253', '6905', '8467', 't', 'l', '7113', 'w', '837', 'v', 'q', '3323', '8341', 'l', '6539', 's', '7277', 'q', '3675', 'j', 'i', '9905', '4429', 't', '8237', 'o', '9383', '9519']
Solution:
i, j, l, m, o, q, s, t, v, w, z