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:
['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']

Ex Output:
g, h, k, m, n, q, t, u, v, w, x


Ex Input:
['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']

Ex Output:
f, k, m, x


Ex Input:
['v', 'q', '2811', 'h', '5911', 'q', '5863', 'w', 'j', '1609', '4915', 'j', 'x', '2469', 'x', 's', 'i', 'a', 'i', 't', '4971', '1211', 'v', '7675', '7921', '8799', 'f', 'r', '6519', '2261', '1715', '7149', 'u', 'c', '4977', 'q', '6427', '5369', 't', 'z', 'k']

Ex Output:

a, c, f, h, i, j, k, q, r, s, t, u, v, w, x, z