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: ['9483', '501', 'j', 'k', '3103']

Output: j, k


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', '891', 'j', 'x', 'n', 'e', 'm', '7881', '7585', 'h', '8963', '6029', '5389', '8729', '4773', 'q', 't', 'z', 'q', 'j', '6053', 'o', 'z', '4553', '8575', 't', 'f', 'c']


Output: c, e, f, h, j, m, n, o, q, t, w, x, z