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: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']

A: a, c, e, g, h, i, k, p, q, r, u, v, w
****
Q: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

A: d, f, i, l
****
Q: ['6747', 'h', '9817', 'q', 'm', '3109', 'e', 'h', '2927', 'l', 'k', '5207', 'y', 'u', 'b', '8247', '7383', '6453', '7379', '8491', '4143', '7413', '6211']

A:
b, e, h, k, l, m, q, u, y
****