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.

['a', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']
a, b, c, d, e, j, k, l, n, o, p, r, y, z

['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']
a, f, h, i, j, k, l, n, p, q, r, u, v, w, x, y

['6155', 'v', '7977', 'l', '9029', 'l', '4881', 'b', '4617', '6563', '3661', 'c', '8013', '1235', '225', 'e', 'y', '451', '837', 'm', 'k']

b, c, e, k, l, m, v, y