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]: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
[EX A]: d, e, h, k, l, n, o, q, r, u, z

[EX Q]: ['8235', 't', '1695', '9899', '3633', 't', '1823', 'r', 'x']
[EX A]: r, t, x

[EX Q]: ['8889', '1191', 'h', 'y', 'x', 'c', '379', 'l', '6305', '3169', 'z', '5239', 'a', '9115', '2561', 'w', '9859', '3813', 'o', '9091', '8517', 'v', '1693', '8621', '4213', '7753', '8551', '8261', '7497', '5589', 'm', '6475', 'a', '1217', '1305', 'u', 'u', '8321', 'z', 'g', '5597', 'x']
[EX A]:
a, c, g, h, l, m, o, u, v, w, x, y, z