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: ['2181', '7019', 'l', 'z', 'z', 'y', '1245', '4179', '6951', '7249', '2723']

A: l, y, z
****
Q: ['8887', '1199', 'r', '7209', 'k', '7567', '7239', 'k', '5123', 'w', '4523', 't', 'd', '5289', '5737', '485', 'w', 't', '7651', 'v', '7213', '7687', 'y', 'w', '7265', 'b', 'b', '3667', 'z', '9935', 'i', 'l', 'u', '6715', 'j', '9815', '8925', '7941', 'w', 'm', '3907', '621', '5523', '5849']

A: b, d, i, j, k, l, m, r, t, u, v, w, y, z
****
Q: ['1791', '5225', '7225', '8265', 'i', 'b', 'w', '7823', '4277', '5803', '7701', '3445', '1329', '4121', 'f', '3453', '3239', '2461', 'x', 'o', 'u']

A:
b, f, i, o, u, w, x
****
