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]: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']
[A]: d, e, k, l, o, s, t, u, w, y


[Q]: ['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']
[A]: b, e, f, g, k, l, n, q, v, w, y


[Q]: ['x', '2945', 'x', 'u', '8671', 'p', '2379', '3029', 'i', '789', '8797', '1763', 'p', 'l', 'z', 'd', 't', 'y', '67']
[A]:
d, i, l, p, t, u, x, y, z