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.

Ex Input:
['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']

Ex Output:
c, e, f, h, j, l, n, p, q, s, v, w, x


Ex Input:
['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']

Ex Output:
b, d, i, j, r


Ex Input:
['f', '3579', 'b', '5389', 'f', '9767', '441', 'a', 'c', 't', 'v', 'y', 'e', '6403', 'u', 'i', 'c', 'q', '621', 'j', 's', 'c', '3325', 'i']

Ex Output:

a, b, c, e, f, i, j, q, s, t, u, v, y