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:
['8815', 'w', '8629', 'y', '3891']

Ex Output:
w, y


Ex Input:
['t', 's', 'v', '9159', 'n', '9359', 'f', 'i', 'p', 't', 'b', '4023', '3913', '3799', 'n', '1473', '9645', 'w', '9235', 'b', '5957', 'o']

Ex Output:

b, f, i, n, o, p, s, t, v, w