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: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']

A: g, i, k, l, m, n, o, p, t, u, w, y
****
Q: ['x', 'u', 'm', '8089', '9985', 'e', '2927', 'n', '7085', 'q', 'v', 'f', 'p', '5079', '3339', '7871', 'h', '7389', '733', 'e', '3387', 'b', 'x', 'z', '2039', 'u', '59', '5031', '8115', '5447', '3045', 'x', '6591', '9561', '4315']

A: b, e, f, h, m, n, p, q, u, v, x, z
****
Q: ['g', 'p', 'w', 'd', '8707', '8707', 'z', '6059', 'g', 'p', '5527', 'e', '4497', 'u', 'd', '5761', 'f', '4949']

A:
d, e, f, g, p, u, w, z
****