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:
['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']

Ex Output:
f, k, m, x

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:
['6367', '1019', '2441', '4023', 'm', 's', '2443', 'f', 'z', '6133', '8425', 'h', '5243', 'h', 'l', '8373', 'i', '2355', '5971', 'h', '4585', 'g', 'w', 'a', 'c', 'e', 'u', '179', 'h', '4375', '4135', 'q', 'g']

Ex Output:
a, c, e, f, g, h, i, l, m, q, s, u, w, z