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.

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

A: d, e, h, i, u
****
Q: ['j', '425', '6223', '6631', 'y', '7649', 'r', 'a', '7933', '7947', 'l', 'l', '8755', 'g', 'b', '3351', '49', 'v', 'm', 'x', '3291', '1007', '1401', 'z', 'q', 'a']

A: a, b, g, j, l, m, q, r, v, x, y, z
****
Q: ['x', 'r', '19', '7619', 'x', 'j', '4127', 'z', 'n', '3189', '4057', 'z', 'b', '3181', '6387']

A:
b, j, n, r, x, z
****