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: ['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', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']

Output: e, g, h, i, n, q, r, s, w, x


Input: Consider Input: ['6935', '5553', '2661', 'u', 'o', '2803', '2497', 'w', '3107', '6797', '445', '2469', '2649', '3027', '947', '8787', 'm', 'q', '6611', 'c', '9585', 'l', '9879', 'd', 'v', 'q', '3947', 'r', 'r', '9637']


Output: c, d, l, m, o, q, r, u, v, w