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]: ['2775', '7507', 'c', '4417', '3449', 'y', 'z', 'e', 'f', '9515', '8555', '7269', '8353', '4239', '4347', '4479', '8645', '9925', 'o', 'h', 'o', '8641', 'y', '3251', '1191', 't', 'x', 'z', '7203', 'b', 'b', '7545', '7283', 'z', 'y', '8127', 'x', 'l', '6251', 'y']
[A]: b, c, e, f, h, l, o, t, x, y, z


[Q]: ['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']
[A]: d, h, q


[Q]: ['d', 'v', '1829', '4047', '4971', 'r', '6535', 'r', '3673', '5501', 'p', 'y', 'g', '2843', 'z', 'd', '4051', '2999', '1765', 'k', '5277', '4191', 'l', '7455']
[A]:
d, g, k, l, p, r, v, y, z