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: ['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']
Example Output: b, v, y

Example Input: ['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']
Example Output: a, c, d, e, f, k, l, m, n, q, t, w, z

Example Input: ['y', 'v', '6367', '407', '5665', '9995', 'f', '879', '7929', '693', 'd', 'k', 's', 'x', '1741', 'k', '5123', '7589', 'j', '3055', 'l', '3877', '3463', '9493', 'w', 'n', '2575', '1527', 'o', '9589']
Example Output:
d, f, j, k, l, n, o, s, v, w, x, y