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]: ['o', 'v', 'w', '7939', '571', '395', '3707', 'm', 'd', 'u', 'o', 'r', '4211', '9645', '8731', '2441', 'y', '8147', '8809', 'e', 'b', '6835', 'i', '2083', 't', '3481', 'f', 'f', '5559', '3601', 'e', '5637', '5185', 't', '6777', '3419', '8637', 'p', 's', 'o', 'x']
[A]: b, d, e, f, i, m, o, p, r, s, t, u, v, w, x, y


[Q]: ['j', '1733', 'p', '6741', '7933', '8943', '733', 'x', '1107', 'z', '1719', '7653', 'y', 'z', '6563', 'p', '4615', 'j', '4489', 'h', 'w', 'y', 'p', 'c', '7949', 'k', 'm', 'r', '9427', '7243', '9777', 'j', '323', '4095', 't']
[A]: c, h, j, k, m, p, r, t, w, x, y, z


[Q]: ['6235', '4789', '7761', 'q', 'x', '1441', '8825', '315', 'w', '3817', 'c', 't', 'h', 'z', 'k', 'f', 'q', '165', 'n', 'x', '1457', '9959', 'j']
[A]:
c, f, h, j, k, n, q, t, w, x, z