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: ['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']

Output: a, c, e, h, j, k, o, s, v, w, x, z


Input: Consider Input: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']

Output: d, e, k, q, s, u, w


Input: Consider Input: ['m', 'b', 'g', 'g', 'a', 'n', '3981', 'w', '6339', 'l', 'j', '8273', 'u', 'k', 'k', 'w', '4017', 'j', 'd', '8911', '7429', '6937', '2879', 'h', '605', '3545', 'b']


Output: a, b, d, g, h, j, k, l, m, n, u, w