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:
['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']

Ex Output:
a, d, h, i, j, m, n, p, y


Ex Input:
['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']

Ex Output:
d, e


Ex Input:
['w', 'h', '7869', 'h', 'p', 'u', '6437', '817', '9905', '1065', 'd', '7', '8257']

Ex Output:

d, h, p, u, w