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.
Q: ['2233', 'j', 'e', '9327', '6673', '6675', 'p', '1211', '2463', '4239', '3709', 'm', 'j', '8437', 'l', 'd', 'm', 'b', '8539', '2403', 'p', 'p', 'x', '8405', '3481', '1015']
A:
b, d, e, j, l, m, p, x