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.

['d', 'o', '7643', '9065']
d, o

['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
a, e, g, j, k, l, o, p, r, s, t, x, y, z

['7803', 'x', '2827', '5497', 'x', 'y', '4673', 't', 'f', '1483', 'c', 'x', '8293', '7925', 's', 'p', '2919', 'a', '7411', 'r', 'e', '6931', '3591', '9225', '6165', '3001', 'd', 'b', '4617', 'r', 'a', 'o', '1427', '1337', 'y', 'w']

a, b, c, d, e, f, o, p, r, s, t, w, x, y