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: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']

A: d, e, h, i, l, m, o, p, q, r, v
****
Q: ['d', 'o', '7643', '9065']

A: d, o
****
Q: ['3457', 'a', '5287', '4181', '6651', 'f', 'a', '3625', 'a', 'm', '1931', '6813', '8749', 'x', '5117', '9125', 'k', 'y', '3475', 'l', '8727', '1265', '3503', '673', 'o', 'u', 's', '5511', '7771', '5669', '2445', 'p', 'd', 'u', 't', 'i', 'j', 'u', '1047', 'v', 'o', 'f', '969', '5695', 'p']

A:
a, d, f, i, j, k, l, m, o, p, s, t, u, v, x, y
****