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: ['8787', 'h', '8279', 'm', '5405', 'm', '697', '7359', 'g', 'd', '519']
A:
d, g, h, m