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', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

Output: b, j, o, t, v, w


Input: Consider Input: ['d', '1625']

Output: d


Input: Consider Input: ['219', 'k', '1623', '1729', 'n', 'a', '6973', '3661', '3697', '1999', 't', '8557', '3803', '9599', 's', 'j', '5209', 'q', 'e', 'l', '4257', 'x', '4525', 'a', 'i', '6477', 'i', 'x', '6169', 'a', 'y', '1291', '1549', 'e', 'm', '7559']


Output: a, e, i, j, k, l, m, n, q, s, t, x, y