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]: ['7073', 'd', 'e']
[A]: d, e


[Q]: ['w', '1081', 'n', '2073', 't', '6351', '5591', 'a', '113', 'w', 'q']
[A]: a, n, q, t, w


[Q]: ['8037', '883', '6761', 'q', '9201', 'q', '9649']
[A]:
q