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.

Ex Input:
['3583', 'd', '1481', 'w', 'l', '7261', '2933', 'n', '8725', 'g', '3441', 'r', '287', '7327', '5637', 'r', '5389', 'm', 'j', 'd', 'a', 'e', 'v', '7879', '1731', 'z', '43', 'q', 'p', '4315', 'p', '3651', 'o', 'l', 's', '9787', 'h', '6735']

Ex Output:
a, d, e, g, h, j, l, m, n, o, p, q, r, s, v, w, z


Ex Input:
['5957', 'd', 'i', 'b', 'e', '5565', 'c', 'i', '2919']

Ex Output:
b, c, d, e, i


Ex Input:
['5745', '8633', 'g', 'z', 'l', 'd', 'i', 'y', '6765', 'v', '6697', '3229', '3217', '6049', '6437', '6925', 'q', 'm', '2385', 'y', 'r', '8705', '8137', '3731', 'o', 'e', '4495']

Ex Output:

d, e, g, i, l, m, o, q, r, v, y, z