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.

Example Input: ['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']
Example Output: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z

Example Input: ['j', '8797', 'i', '5443', 'i', 'f', '7593', 'u', 'h', '3251', 'l', '681', 'y', 'n', 'r', '1699', '1379', '8987', '6955', 'x', 'p', 'x', '553', 'q', '5679', 'q', 'w', '9007', 'r', '8945', '7351', 'a', 'v', 'k', '1309', 'v', 'i', '4161', 'a', 'q', '2919', '6917', '6845']
Example Output: a, f, h, i, j, k, l, n, p, q, r, u, v, w, x, y

Example Input: ['9931', 'a', '8077', '2707', '6735', 'a', '1619', 's', 'n', '7147', 'i', 'l', '8425', 'z', '817', 'z', 'z', '4547', '1399', 'w', 'l']
Example Output:
a, i, l, n, s, w, z