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: ['l', '6819', '1029', '2925', '2361', '5545', '2151', '2681', 'f', 'p', '1263', '2875', 'b', '4665', 'f', 'g', 'p', '4829', '8453', 'z', 'l', '4219', '7517', '25', 'a', '5099', '3693', 'i', '1815', '1541', 'g', '7665']

A: a, b, f, g, i, l, p, z
****
Q: ['8489', 'h']

A: h
****
Q: ['y', 'i', 'x', '7367', 'w', '7017', '583', '373', '2983', 'r', '1495']

A:
i, r, w, x, y
****