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:
['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']

Ex Output:
b, l, r, v, y

Ex Input:
['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']

Ex Output:
c, e, h, k, p, q, u, v, y

Ex Input:
['j', 'r', '7253', '1999', '8739', '4567', 'x', 'a', 'j', '4385', '5165', 'k', '3167', '771', '7537', 'r', '5589', 'w', '5199', '6863', '8185', '9847', '4495', '6721', 'v', '387', '3435', 'n', 't', 'v']

Ex Output:
a, j, k, n, r, t, v, w, x