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]: ['8489', 'h']
[A]: h


[Q]: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']
[A]: d, f, g, i, k, t, v, w


[Q]: ['i', 'y', '2235', '1347', 'm', 'l']
[A]:
i, l, m, y