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: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']

Output: g, i, l, m, o, r, s, y


Input: Consider Input: ['t', 'r', '2959', '2517', 'a', '9959', '729', '511', 'y', 'r', '465', 'c', '687', 'm', 'b', 'm', '3449', '9713', 'g', '8275', '8823', 'a', 'z', 'w', '2185', '6283', '8457', '8137', '7163', '8329']

Output: a, b, c, g, m, r, t, w, y, z


Input: Consider Input: ['6185', '8681', '3673', 's', '727', 's', '3265', '8095', '6019', 'd', 'j', '5409', '9215', '5337', 'i', 'u', '8227', '2851', '5465', '8675']


Output: d, i, j, s, u