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.

Input: Consider Input: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']

Output: a, h, m, n, p, s, v, w, y


Input: Consider Input: ['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']

Output: a, b, c, d, e, g, k, n, o, q, t, u, w, x, y, z


Input: Consider Input: ['2367', '107', 'k', 'h', 'r', 'z', 'f', 'u', 'r', '3263', '3367', 'c', 'k', '4949', 'o', 'c', '3425', 'q', 'n', 'k', 'w', '5019']


Output: c, f, h, k, n, o, q, r, u, w, z