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: ['9873', '8665', '9761', 'n', '9597', '2721', '3197', '3975', 'p', '9745', '6333', 'p', '6181', 'i', 'v', 'd', 's', '381', '7397', 't', 'h', '9625', '8707', 'g']
A:
d, g, h, i, n, p, s, t, v