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: ['j', 'p', '8333', '8079', '4703', '7089', '8859', 'b', 'y', 'g', '7971', '6999', '2011', 'k', 'e', '9609', '4179', '3993', 'u', '3957', '6313', '4229', 'k', '5963', 'e', 'y', 'r', 'e', 'a', '2213', 'e', 'i', 'f', '7979', 'r', 'a', 'h', 'e', 'n']
Example Output: a, b, e, f, g, h, i, j, k, n, p, r, u, y

Example Input: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
Example Output: b, d, i, j, r

Example Input: ['7517', 'b', 'c', 'h', '957', 'e', 'q', 'p', '2641', 't', 't', 'd', 'x', 't', '6395', '1403', '3207', 'y', 'r', '2965', 's', 'o', 'b', 'n', 'd', 'e', '935', '1349', '4539', '8367', '3719', 'g', 'c', 'i', '3203', '3075', 'i', '479']
Example Output:
b, c, d, e, g, h, i, n, o, p, q, r, s, t, x, y