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: ['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']

Output: a, c, e, h, i, o, p, s, u, w, x, z


Input: Consider Input: ['4857', 'z', '313', '7813', '9935', 'o', 'w', 'i', 'x', 'o', 'e', 's', 'a', 'p', 'i', 'v', 'x', '6743', 'p', '435', 'u', 'a', 'h', '607', '2491', '6159', 'u', '7761', '6197', '3449', '3459', 'e', 'g', '8731', '335', '2883', '3941', 'n', '1881', 'y', 'j', '8189', 'k', '7593', '2747']

Output: a, e, g, h, i, j, k, n, o, p, s, u, v, w, x, y, z


Input: Consider Input: ['6055', 's', 'h', '4061', 'y', 'g', '971', 'o', '9697', '5265', 'w', 'z', '5597', 'a', '8161', '3865', 'e', '771', 'g', '6351', '2683', 'j']


Output: a, e, g, h, j, o, s, w, y, z