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: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

A: b, j, o, t, v, w
****
Q: ['5193', 'h', 'm', '703']

A: h, m
****
Q: ['e', '9315', '5857', '1575', 'o', '5523', '527', '1273', '8477']

A:
e, o
****