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: ['7343', '2599', 's', '9849', 'b', 'm', '3387', '5331', 's', '6405', 'h', '1051', 'r', '7219', 'z', 'w', '9713', '4909', '3723', '5051', '4959', '4149', '4527']
A:
b, h, m, r, s, w, z