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: ['a', '2579', 'f', '6787', '123', '225', '6499', '4419', 'o', '1785', '7981', 'z', 'b', '2441', '2821', 'o', 'k', '2747', 's', 'u', 'q', '3901', '7629', 'k', 'm', 'q', '6577']

Output: a, b, f, k, m, o, q, s, u, z


Input: Consider Input: ['f', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']

Output: a, b, d, f, j, k, m, r, t, u, w, x, z


Input: Consider Input: ['n', 'j', '7653', '4293', 'h', '1321', '3471', 'y', 'w', 'i', 'p', 'e', '6053', 'x', 'c', '4503', 'y', 'd', 'q', '315', 'f', '557', '459', 'm', '8267', 'b', '3677', 'e', 'f', '5393', 'a', '8307']


Output: a, b, c, d, e, f, h, i, j, m, n, p, q, w, x, y