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:
['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']

Ex Output:
a, b, d, e, h, i, j, m, o, q, r, t, u, v, y


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:
['p', '8607', '7859', 'f', '5931', '7449', '3787', '9261', 'e', 'p', 'y', '9625', 'a', '4209', '2161', 'h', '9249', 'r', '9171', 'h', '1433', '8807', 'x', '6655', '1939', 's']

Ex Output:

a, e, f, h, p, r, s, x, y