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: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']

A: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w
****
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: ['k', 'p', 'l', '9885', '5235', '4221', '9129', 'v', 'k', 'v', '8301', 'p', '9091', 'e', '4501', 'u', '3993', '7191', 'o', '6147', 'a', 'n', '7', 'd', '863', 'e', '1261', 'c', 'b', '2741', 'r', 'n', 's', '4341', 'e', '2399', '3401', '8071', 'c', '197', '2701']

A:
a, b, c, d, e, k, l, n, o, p, r, s, u, v
****