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.
Input: ['5543', '7865', 'g', 'h', 'v', 'q', '3075', '7079', '5063', '9823']
Output:
g, h, q, v