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:
['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

Ex Output:
b, d, f, m, o, p, r, v, x, y


Ex Input:
['1711', '9745', '7605', '6709', '9645', '4353', '4945', 'h', 'i', 'b', '4945', 'v', '8335', '6507', '8955', '4967', 'p', 'j', '4121', 'w', 'n', 'c', 'p', '803', '5857', 'v', '8555', 'z', '6847', 'y', 'r', '297', 'l', '7337', 'y', '8375', 'l', '4463', '8463']

Ex Output:

b, c, h, i, j, l, n, p, r, v, w, y, z