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: ['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']

Output: a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z


Input: Consider Input: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']

Output: d, i, j, m, s, t, v, z


Input: Consider Input: ['y', '6991', 'y', 'n', '7727', '1265', '2207', 'd', 'b', '267', '2649', '5689', 'n', '7977', 'n', '5249', 'p', '4511', 'b', '7069', '4451', '7241', '1509', 'x', 'j', 'w', '1855', '4191', '7035', '5169', 'r', 'z', '3331', 'w', 'e', 'o', 'b', '6941']


Output: b, d, e, j, n, o, p, r, w, x, y, z