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]: ['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']
[A]: f, i, k, n, q, r, s, w, y


[Q]: ['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
[A]: g, n, q, w, z


[Q]: ['357', 'i', '2379', '8835', 'n', '8971', 't', '1879', '1597', '3241', '4271', 'm', 'e', '5465', 'e', '6037', 'r', 'k', 'z', '4999', 'h', 't', 'g', 'g', 'y', 'b', '4765']
[A]:
b, e, g, h, i, k, m, n, r, t, y, z