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:
['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']

Ex Output:
b, d, f, j, k, n, o, q, r, u, z

Ex Input:
['c', '8389', 'j', '6113', '5843', 'f']

Ex Output:
c, f, j

Ex Input:
['f', '5081', '2015', '6171', '3329', 'l', '6603', '7489', 'i', 'n', 'v']

Ex Output:
f, i, l, n, v