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', 'z', '5199', 'x']

Output: e, x, z


Input: Consider Input: ['d', 'p', 'k', '9679', 'x', 'j', '7481', '1815', 't', 'w', '6513', 'j', '5079', '5219', 'p', '9545', 'a', '1931', '9973', '8125', '5169', '2791', 't', 'd', '2057', 'e', 'x', 'y', '7409', 'u']

Output: a, d, e, j, k, p, t, u, w, x, y


Input: Consider Input: ['1885', 'r', 'n', '3099', 't', 'h', 'e', '205', '9549', '8795', '3319', '1915', 'r', '2601', 'b', 'r', 't', '8079', '3055', '1587', '9217', 'd', '2699', 'n', '4961', 'z', 'w', 'm', 'x', '6731', 'm']


Output: b, d, e, h, m, n, r, t, w, x, z