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: ['4123', '1397', '103', 'w', 't', 'j', '233', '7239', 'b', 'n', 't', '6273', 'l', '1167', '8389', '5609', '9029', '7741', 'o', 'p', '6547', '5593', 'd', '8401', 's', '4243', 's', 'u', 'm', '6659', '5691', '2105', '8897']

A: b, d, j, l, m, n, o, p, s, t, u, w
****
Q: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']

A: e, f, l, n, p, q, r, s, w, y
****
Q: ['n', '5213', 'o', '6491', 'c', 'e', 'o', 's', '1733', 'm', '2781', '2821', 'r', '545', '2015', '2725', '3543', '8247', '3363', 'l', 'h', 'y', '19', 'c', '491', '6493', '6317', 'a', '7833', '4103', 'p', 'v', '37', '9169', '4945']

A:
a, c, e, h, l, m, n, o, p, r, s, v, y
****