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]: ['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']
[A]: b, c, d, e, j, k, l, p, s, t, u, w, y


[Q]: ['897', '2917', 'm', 'i', '9701', '9653', '9989', '5323', '7171', 'r', 'l', '911', 'f', 'u', '2605', 'k', 'n', 's', '6147', 'g', '2447', '3891', 'a', 'n', 'g', '7867', 'j', '6963', 'g']
[A]:
a, f, g, i, j, k, l, m, n, r, s, u