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: ['6847', 'u', 'g', 'x', 'v', '2285', '8559', 'b', '5635', '227', 's', 'u', 'w', '9739', '1265', 'y', 'd', 'e', 'h', '7165', '9237', 'd', 'm', '7641', '4853', 'v']
A:
b, d, e, g, h, m, s, u, v, w, x, y