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: ['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: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']

Output: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z


Input: Consider Input: ['403', '8283', 'c', 'j', '3437', 'j', 'p', '2935', '3893', '2121', '683', 'f', 'v', '9969', '7915', '4445', '8679', '5713', '8745', '1817', 'x', 'n', '8627', 't', 'p', '2485', '2767', 'a', '7599', 'u', '7479', 'j']


Output: a, c, f, j, n, p, t, u, v, x