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: ['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

A: f, h, i, l, o, q, r, t, u, v, x
****
Q: ['1945', 't', '4477', '4439', '6569', '2021', 'y', 't', '2725', '8947', '6921', '1373', '8107', 'g', 'c', 'w', 'x', 'b', '9117', 'k', '6567', '5073', '2307', 'e', 'b', '7405', 'e', 'x', '1419', 'd', 'o', 'n', 'a', '2647', 'z', '1459', 'n', '6137', 'u', 'b', 'q', '4459']

A: a, b, c, d, e, g, k, n, o, q, t, u, w, x, y, z
****
Q: ['k', 'o', '9633', '9733', 'z', '9411', 'p', 'r', '1887', '2739', 'y', 'r', '7235', '8471', 'd', 'b', '6827', 'u', '6169', 'n', '2137', 'o', 'v', '6411', 'a', 'c', 'a', '5533', 'z']

A:
a, b, c, d, k, n, o, p, r, u, v, y, z
****