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:
['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']

Ex Output:
c, i, m, v


Ex Input:
['2329', 'i']

Ex Output:
i


Ex Input:
['e', 'd', 'l', 'h', 'p', '8181', '1685', '4977', '23', '6119', '1147', 'y', '6689', '4069', 'd', '2259', '4359', '7859', 'h', 'j', '3791', 'u', '3949', '1983', '2953', 'v', '3241', 'k', '8865', 'x', 'k', 'f', 'p', 't', 'v', '1285', 'i', '6347', '1333', '2327']

Ex Output:

d, e, f, h, i, j, k, l, p, t, u, v, x, y