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]: ['n', 'h', 'h', 'e', 'p', '1265', '4853', '9433', '1227', '1619', '6381', 'o', '8285', 'k', 'u', '7471', 'm', '6887', '6579', '5813', '5563', '8535', 'n', '3743', 'h', 't', '4497', '2791', 'e', 'v', '6769', '7969', 'x', 't', 'x', 'q']
[A]: e, h, k, m, n, o, p, q, t, u, v, x


[Q]: ['1417', 'd', 'b', 'b', '711', 'z', 'j', '6383', 'l', 'l', '3353', 'u', 'f', '9395', 'd', '4289', 'l', '5545', '8023', 'd', 'e', 'k', 'd', 'w', '3517', 'c', '9593', 'b', 'x', '9733', 'b', 'w', '5225', '8197']
[A]:
b, c, d, e, f, j, k, l, u, w, x, z