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.

[EX 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']
[EX A]: e, h, k, m, n, o, p, q, t, u, v, x

[EX Q]: ['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']
[EX A]: c, g, j, m, q, r, s, w

[EX Q]: ['6379', '5623', 'b', '7083', 'r', '4183', 'j', 's', 't', 'q', '4379', '1399', '8251', '6671', '189', '5017', 't', 'k', 'x', 'q', 't', 'n', '8361', '4725', '4319', 'w', '3151', 'a', 'a', '3441', 'r', 'g', 'b', '1059', '4993', 'n', '7833', '7935', 'm', 'd']
[EX A]:
a, b, d, g, j, k, m, n, q, r, s, t, w, x