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: ['1189', '7143', '993', '1513', '6449', '9749', '5963', '8159', 't', '3543', 'j', 'i', '4227', '1463', '6431', '4987', 'y', 'q', 'f', '321', 'm', 'r']

Output: f, i, j, m, q, r, t, y


Input: Consider Input: ['s', 'c', 'e', '2457', '9413', 'r', '9949', 's', 'z', 'e', 'a', 'o', '7207']

Output: a, c, e, o, r, s, z


Input: Consider Input: ['4855', '6989', '6961', 'a', 'k', 'y', 'h', '1791', '4857', 'v', 'z', '8789', 'j']


Output: a, h, j, k, v, y, z