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]: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']
[A]: a, c, i, m, n, p, q, s, t, u, v, z


[Q]: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']
[A]: b, d, i, p, r, t, u, v, w, y, z


[Q]: ['q', '2057', 'e', '3481', 'c', '567', '237', '2911', '3597', '9263', '529', '5743', 'y', '1549', '4915', '4795', 'f', 'r', '5773', 'a', 'l', '5911', 'x', '1705', 'f', '2517', '4669', '3617', 'p', 'g', 'n']
[A]:
a, c, e, f, g, l, n, p, q, r, x, y