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.

['6411', 'x', 'i', '267', 'z', 'e', '5483', '8033', '3697', 'z', '4167', 'e', 'f', '7229', 'i', 't', '2197', 'g']
e, f, g, i, t, x, z

['u', 'w', '401', 't', 'g', 'h', 'g', '8073', '9597', '1347', '7835', '5007', '977', 'p', '7679', 'b', '4883', '4931', '999', 'r', '1181', 'x', '2063', 'l', 'w', 'i', 'l', 'x', 'i', '9057', '5007', 'w', '743', '1635', 'y', 'f', '9227', 'z', '5227', 'd', '7129', 'k', '7657']
b, d, f, g, h, i, k, l, p, r, t, u, w, x, y, z

['j', 'x', '5513', 'b', 'y', 'q', '741', '9693', 'e', '3329', 't', 'w', 'o', '4677', 'x', 'c', 'q', '1031', '9085', '4577', 'p', 'x', 'w', 'f', 'g', '8935', '1293', 'h', 'j', 'k', '9275', '573', 'h', '2931', 'z']

b, c, e, f, g, h, j, k, o, p, q, t, w, x, y, z