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: ['5957', 'd', 'i', 'b', 'e', '5565', 'c', 'i', '2919']

Output: b, c, d, e, i


Input: Consider Input: ['1121', 'j', '1433', 'g', 'l', '1479', '1699', 'j', 'a', '8507', 'd', 'a', '5229', 'k', 'x', '4549', 'e', 'p', '1367', 'u', 'd', '785', '215', 'e', 'f', 'a', '101', '7575', '7965', 'p', 'i', '5637', '1005', 'i', 'y', '181', 'r']

Output: a, d, e, f, g, i, j, k, l, p, r, u, x, y


Input: Consider Input: ['b', '8479', 'q', 'p', '271', '5873', 'm', 'v', 'f', '1207', '811', 'j', 'm', 'l', 'x', '6147', '3775', 'g', '6857', 'm', '2757', '1049', 'k', '2831', 's', '4497', '4519', 'w', '5475', 'g', 'i']


Output: b, f, g, i, j, k, l, m, p, q, s, v, w, x