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: ['w', 'i', '4383', '7667', '9617', 'y', 'a', '8051', 'w', '4857', 'y', '3953', 'u', 'o', 'y', 'i', '9201', 'g', '1807', '5367', 'g', '5263', '3995', '6665', '3113', '9433', '6315', 'm', '845', 'x', 'c', 'v', 'h', '1491', 'g', '3519', 'x', 'b', '7695']

Output: a, b, c, g, h, i, m, o, u, v, w, x, y


Input: Consider Input: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']

Output: f, g, h, m, n, o, q, t, v, z


Input: Consider Input: ['1637', '4705', 'a', '5113', 'c', '3837', '3609', 'o', 'f', '5443', 'g', '363', '9611', '8665', '2479', '1923', 'j', '6571', 'o', '9465', '8181', '3817', 'v', 'w', '5585', 'd', 'g', 'o', 'l', 'f', '6457', '9091', '4681', 'y', 'x', 't', '211', '5659']


Output: a, c, d, f, g, j, l, o, t, v, w, x, y