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: ['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']
Example Output: a, d, f, h, i, j, k, m, o, p, q, s, t, y

Example Input: ['b', 'd', '8153', 'u', '3695', '5317']
Example Output: b, d, u

Example Input: ['e', 'r', '2207', 'g', '1937', 'e', 'm', 't', '8711', 'x', 'r', 'c', '2007', '7285', 'j', '4025', '177', 'd', '99', '7935', 'a', '2617', 't', 'b', 'a', '1777', '7893', '4923', '8835', 'd', 'w', 't', '2325', '7957', 'h', '5151', '9431', '3697']
Example Output:
a, b, c, d, e, g, h, j, m, r, t, w, x