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]: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
[A]: d, e, k, q, s, u, w


[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]: ['u', 'o', '7235', '8287', 'm', 's', '5083', '6147', '8381', '907', '725', 'm', 's', 'l', 'f', '7143', '5039', '6801', '8133', 'f', '6909', '5895']
[A]:
f, l, m, o, s, u