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.

[Q]: ['7073', 'd', 'e']
[A]: d, e


[Q]: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']
[A]: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z


[Q]: ['2977', '9657', '1917', 'i', '6987', 'z', '6841', 'z', '9007', '3385', '7669', '9675', 'y', 'r', 'r', 'g', 'o', '2913', 'u', 'k', 'v', '6547', '2191', 'o', '5643', '3441', '1079', '449', 'q', 'k', '893', 'o', 'e', 'b', 'v']
[A]:
b, e, g, i, k, o, q, r, u, v, y, z