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:
['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

Ex Output:
b, f, g, j, q, r


Ex Input:
['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']

Ex Output:
b, e, f, i, k, l, m, o, p, q, r, t, v, w, y


Ex Input:
['2021', 'k', '169', '4283', 'x', 'c', 'r', 'v', '897', '1675', '3761', '8875', '7723', 'v', '3525', 'v', 'd', '1537', '4837', '3367', '7077', 'f', 'e', '1899', 'n', '2737', 'b', '8207', 'i', '9583', 'f', 'n', '3031', '6047', 'e', 'o', '3583', 'd', 'p', '3893', 'f', '7039', 'd', 'j']

Ex Output:

b, c, d, e, f, i, j, k, n, o, p, r, v, x