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: ['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']

Output: a, b, c, f, g, h, j, k, p, r, v, w, x, y


Input: Consider Input: ['w', '1081', 'n', '2073', 't', '6351', '5591', 'a', '113', 'w', 'q']

Output: a, n, q, t, w


Input: Consider Input: ['m', 'q', 'z', '9171', 'j', 'p', '1585', '5799', 'e', 'p', 'k', 'z', 'g', '5063', 'i', 's', '9781', '2309', '6837', '567', 'm', '9023', 'x', 't', 'y']


Output: e, g, i, j, k, m, p, q, s, t, x, y, z