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]: ['e', 'z', '5199', 'x']
[A]: e, x, z


[Q]: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
[A]: a, h, o, p, y


[Q]: ['v', '6569', 'f', 'y', 'z', 'q', 'j', 'l', 'g', 'o', 'w', 'c', '4741', '643', '5213', 'w', 'c', '4229', 'e', '9985', '2391', '6291', 'j', 'c', '807']
[A]:
c, e, f, g, j, l, o, q, v, w, y, z