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: ['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: ['5159', '6407', '4021', '6655', 'c', 'k', 'w', '7191', 'l', '4321', '1609', 'm', '1991', '9261', '511', 'p', '7495', 'b', 'e', '4647', '2711', 'd', 'y', '3835', '5037', '3613', '2695', '3367', 'm', 'j', 'y', '9561', '4889', 'a', 'z', '2253', 'p', 't', 's', '8371', '2859', 's']

A: a, b, c, d, e, j, k, l, m, p, s, t, w, y, z
****
Q: ['l', '8943', 's', 'p', 'l', 'g', '6489', '3383', 'p', '6545', 's', '5999', '4379', '3525', '6161', 't', 'm', 'n', '265', 'c', 'z', 'v', '7709', 'e', '3401', 'c', '6641', 'k', '1179', '9945', 'p', '3091', 'z', 'c', 'c', '4391', '5761', '3221', 'b', 'l', 'r', '7595']

A:
b, c, e, g, k, l, m, n, p, r, s, t, v, z
****