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:
['9783', '3185', '8225', 'u', '1123', 'd', '3453', 'i', '7713', '8457', '8609', 'h', '2767', 'e', '7191', '2929', '1089', '393', 'e', 'd', '11', '9329', '683', '1271']

Ex Output:
d, e, h, i, u


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

Ex Output:
c, f, j


Ex Input:
['a', '8881', 'e', '565', '2693', 'p', 'v', '2537', 'v']

Ex Output:

a, e, p, v