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: ['6175', '9441', '7127', '5979', 's', '1367', 'e', 'm', '7083', '1787', '8375', '2851', '3475', 'r', '697', 'g', 'z', 'm', '4207', 'c', '7971', 'z', '9339', 'd', 's', '3507', '9003', 'i', 'y', 'w', 'j', 'i']

Output: c, d, e, g, i, j, m, r, s, w, y, z

Input: Consider Input: ['i', '1191', '5581', '2527', 'g', '9795', '519', 'u', '8389', '9793', 'k', '5733', '7125', '7835', 'j', '855', 'd', 'd', '6555', '3211', 'l', 'o', 'b', '523', 'x', 'j', '1707', '4161', '7171', 'h', 'h', 'm', 'h', '2443', 'e', '649', '951', 'n', 'h']

Output: b, d, e, g, h, i, j, k, l, m, n, o, u, x

Input: Consider Input: ['w', '6013', '8705', '6277', 'i', 'y', '8679', 'o', 'x', '3667', '4067', 'v', 'q', 'n', 'g', 'k', '4077', 'b', 'g', '5509', '7961', '3033', 'f', 'c', '9083', '8805', 'f', '3531', 'n', '2479', '4811', '6503', '711', '4431']
Output: b, c, f, g, i, k, n, o, q, v, w, x, y