Definition: 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.
Input: ['713', 'y', '3263', '7089', '3929', '9013', 'p', 'j', '3573', '3541']

j, p, y