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: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']

A: e, g, h, i, p, r, y
****
Q: ['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: a, b, c, d, e, j, k, l, n, o, p, r, y, z
****
Q: ['v', '3749', '5769', '9379', 'h', '5875', '4861', '9337', 'o', '5473', '293', 'l', '6107', 'j', 'r', 'd', 'j', '8007', '6039', '1315', '6575', '5431', 'q', 'l', 's', '4897', 'q', '4413', 'j', 'c', 'b', '8499', '3085', 'g', '4261', '4771']

A:
b, c, d, g, h, j, l, o, q, r, s, v
****