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]: ['8821', '9833', 'l']
[A]: l


[Q]: ['3307', 'r', '2665', '3453', 'f', 'd', 'v', '3801', '3153', '3137', 'y', 'i', '9681', 'k', '9253', 'y', 'i', '8631', '2375', '5131', 'r', 'z', '8645', '595', 's', '6749', '2665', '709', '8203']
[A]: d, f, i, k, r, s, v, y, z


[Q]: ['423', 'c', 'y', '4257', '2301', '1567', 't', 'j', '179', '4271', 'v', '9039', 'm', 'w', '3639', 'r', 'f', '8555', 'e', 'f', '1919', '1567']
[A]:
c, e, f, j, m, r, t, v, w, y