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:
['i', '1129', 'f']

Ex Output:
f, i


Ex Input:
['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']

Ex Output:
f, h, o, p, r, s, u, w, y, z


Ex Input:
['q', '1197', '191', 'j', '7907', 'k', 'z', '8271', 'j', 'z', '3547', '3441', '4715', 'k', 's', 's', 't', '2663', 'r', 'n', 't', 't', '4859', '1643', '8765', '2941', '1745', 'v', 'h', '6777', 'v', 't', '6955', '4555', '819', '9257', '1609', 'z', 'f', 'n', '9607', '3539', '9701', '6883', 'm']

Ex Output:

f, h, j, k, m, n, q, r, s, t, v, z