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.

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

['6627', '8037', 'q', 'e', 'j', 'p', '9613', '9317', 'm', 'm', '5345', 'f', '8105', '5665', '4175', '4793', '3707', 'i', 'b', '6745', '747', '8329', '1481', 'b', '8949', 'n', '4803', '1359', '3533', 'f', '543', '3003', '6943']
b, e, f, i, j, m, n, p, q

['i', 'b', '9201', 'a', '8913', '1463', '6741', '7371', '3185', 'y', 'w', '6025', '4757', '2045', 'g', '1475', 't', 'z', 'l', '9939', 'w', 'z', '203', '4013', '3265', 'm', 'j', '9349', 'x', 'f', 'z', 'f', '1269']

a, b, f, g, i, j, l, m, t, w, x, y, z