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: ['7911', '7175', 'y', '9173', 'y', '2529', '831', 'k', '7197', 'j', '2343', 'i', 'b', '6799', '5987', '7277', 'n', 'x', 'h', '7209', 'l', 'd', 'm', 'e', '2277', '8909', 'x', '5361']

Output: b, d, e, h, i, j, k, l, m, n, x, y


Input: Consider Input: ['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']

Output: a, b, c, e, f, g, j, l, o, q, s, t, u, w, y


Input: Consider Input: ['h', '4453', 'o', 'n', '2205', 'y', '6373', 'g', 'u', '4349', 'n', 'q', 't', 'z', '9817', 'y', '9033', '1895', '2801', '7639', 'q', '2503', '7599', 'g', 'd', '3529', '191', '3309', '7231', '7721', 'q', 'b', '8855', 'w', '5031']


Output: b, d, g, h, n, o, q, t, u, w, y, z