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]: ['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']
[A]: a, b, e, j, l, n, p, r, t, u, w, x, y, z


[Q]: ['a', 'p', 'y', 'l', 'l']
[A]: a, l, p, y


[Q]: ['u', 'h', 'r', '5243', 'k', '2351', '995', 't', 'x', 'u', 'e', '6583', 'r', '2493', 'j', 'q', '9891', 'b', '3915', '549', '481', '7797', 'p', '1403', 'h', 'i', '9699', '9125', '6945', 'd', 'b', '2645', 'j', 'z', 'p', 'w', '935', 'w', 'o', '5855']
[A]:
b, d, e, h, i, j, k, o, p, q, r, t, u, w, x, z