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: ['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']

Output: a, d, g, w


Input: Consider Input: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

Output: c, d, g, i, j, k, n, o, q, r, s, t, y, z


Input: Consider Input: ['m', 's', '8515', 's', 'j', '3771', 'o', 'f', '3257', '4857', '4411', '5869', '6741', '8151', '2023', '6039']


Output: f, j, m, o, s