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.
--------
Question: ['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']

Answer: e, f, g, k, n, p, q


Question: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']

Answer: b, q, t, u, x, y


Question: ['1313', 'i', '189', 'y', 'c', 'm', '6589', '5913', 'c', 'u', '7525', 's', 'q']

Answer:
c, i, m, q, s, u, y