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: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']

A: c, d, e, f, l, n, p, q, t, u, v, y
****
Q: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']

A: a, j, r, z
****
Q: ['z', '8049', '7763', 'z', 'm', '9759', 'd', '1845', '2285', 'l', '8143', 'i', '849', '6189', 'z', '9485', '9403', 'e', '3179', '1317', '9503', '7669', '5585', 'k', 'z', 'i', 'p', 'a', '3133', 'f', 'n', '9211', '8139', '263', '4301', '2961', '5263', '8745', 'v', 's', '2827', 'z']

A:
a, d, e, f, i, k, l, m, n, p, s, v, z
****