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]: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
[A]: a, d, h, i, j, m, n, p, y


[Q]: ['9385', '4021', 'y', '9629', 'u', '7623', 'd', '5155', 'x', '2605', '8893', 'l', 'p', 'a', 'm', '6699', 'i', '4503', '6623', 'm', 'l', '6115', 'p', 'w', '9691', '811', '4769', '2659', 'x', 'c', '6513', '5499', 's', 'q', 'f', 'v', 'z', 'w', 'z', '1361']
[A]: a, c, d, f, i, l, m, p, q, s, u, v, w, x, y, z


[Q]: ['n', 't', 'r', '9201', '7163', 'k', '6683', '5623', 'f', '8269', 'v', '4859', '4257', 't', 'g', '1311', 'c', '4791', 'g', '2185', '3597']
[A]:
c, f, g, k, n, r, t, v