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: ['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']
Example Output: c, i, m, n, p, z

Example Input: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
Example Output: a, h, o, p, y

Example Input: ['h', 't', 'd', 't', '3297', '6491', 'g', '399', '2655', '6271', 's', '7545', 'i', 's', '8519', 'j', '3629', '2167', 'o', '1237', 'x', 'z', 'b', 'o', '6847', 'r', 'x', '967', 'y', 'o', '7835', 'e', 'a', 'p', 'd', '5419', '8317', '6355', '1133']
Example Output:
a, b, d, e, g, h, i, j, o, p, r, s, t, x, y, z