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:
['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']

Ex Output:
c, f, g, k, n, p, q, r, u, w


Ex Input:
['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']

Ex Output:
a, b, c, f, g, h, i, k, l, o, p, r, s, t, u


Ex Input:
['1525', '4091', 'x', 'u', 't', 'u', 'd', 's', 'x', 'h', 'k', 'k', 'j', 'q', 'p', 't', '2593', 'j', 'k', 'y', 'w', 'q', 't', 'b', '5795', 'm', 'e', '9299', '7841', '109', '1323', '8411', '2019', '7421', 't', '8119', '4217', '2061', '8735', 'd']

Ex Output:

b, d, e, h, j, k, m, p, q, s, t, u, w, x, y