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]: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']
[A]: d, f, i, l


[Q]: ['4417', 'x', '4641', '885', '8485', 'd', '7057', '8519', 'm', 'i', 'l', '4627', '3069', 'v', '5011', 'u', '6673', 'h', '4541', 'j', '2337', '8175', '4797', 'f', '9109', 'q', 'q']
[A]: d, f, h, i, j, l, m, q, u, v, x


[Q]: ['z', 'k', 'j', 'u', 't', '799', '8003', 'd', 'b', 'j', 'c', '1379', 'i', 'j', '7497', 'v', 'w', 'y', 'j', 'j', '7733', '715', 'j', '1431', 'f', '9169', '8759', '9229', '8959', 't', '3303', '9377', 'u', '8217', '8781', 'x', '6453', 'd', 'u', '5459', '119']
[A]:
b, c, d, f, i, j, k, t, u, v, w, x, y, z