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]: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
[A]: c, f, j, k, o, y


[Q]: ['d', '2359', '6571', 'c', 'n', 'u', '9513', '9321', '1689', 'b', '969', '1823', 'e', 'b', '9147', 's', '1811', 'k', '5443', '8699', '5483', 'v', 'w', 'n', '1215']
[A]: b, c, d, e, k, n, s, u, v, w


[Q]: ['e', 'n', 'a', '4363', '105', '8023', '6797', '6317', 'n', 'a', 'd', '1243', 'u']
[A]:
a, d, e, n, u