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: ['l', 'e', '9565', '8179', '1341', '9671', 'd', '6197', 'v', '5533']

d, e, l, v