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: ['6745', 'q', '883', 'n', 'e', '4167', '6191', 'e', 's', 'x', '9369', 'v', 'o', 'f', '6307', '1737', 'j', '8329', 'w', '3237', '5505', 'y', 'g', '9729']
A:
e, f, g, j, n, o, q, s, v, w, x, y