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: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']

A: a, b, c, j, l, r, t, v, x
****
Q: ['2329', 'i']

A: i
****
Q: ['s', '9443', '5991', 'f', '1127', '8531', '8989', 'i', '2975', '3991', 'q', '5225', '8431', 'g', 'm', 'v', '2349', '2285', 'b', '8893']

A:
b, f, g, i, m, q, s, v
****