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: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

Output: d, f, i, l


Input: Consider Input: ['983', 'e', '3735', '4037', 'x', '3745', 'm', 'x', '8883', 'v', 'k', 'e', 'u', '3915', '4145', 'l', '9677', 'k', 'w', 'y', '4917', 'f', 'm', '2657', '3605', '5693', 'y', 't', '5151', '3125', '5895', '5171', 'g', 'u', '4207', 'k', 'd', 'r', 't', '6967', '5571', 'n', 'l', 'a']


Output: a, d, e, f, g, k, l, m, n, r, t, u, v, w, x, y