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.

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

Example Input: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']
Example Output: d, f, g, i, k, t, v, w

Example Input: ['t', 'n', 'f', 'y', 'u', 'n', 's', 'o', '8161', 'x', 'l', '7183', 'b', '4345', 'd', 'b', 'h', '5171', '3851', '6055', '5291', 'y', 'n', 'm']
Example Output:
b, d, f, h, l, m, n, o, s, t, u, x, y