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]: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
[EX A]: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y

[EX Q]: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']
[EX A]: d, f, i, m, x

[EX Q]: ['o', 'c', '3101', '6719', 'g', '2723', 'b', 'e', 'g', '9887', '4795', 'o', 'j', '7097', '8981', '469', '6243', '6191', '4893', '1395', 'v', 'g', '6991', '5785', '4145', '3319', '5985']
[EX A]:
b, c, e, g, j, o, v