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:
['2775', '7507', 'c', '4417', '3449', 'y', 'z', 'e', 'f', '9515', '8555', '7269', '8353', '4239', '4347', '4479', '8645', '9925', 'o', 'h', 'o', '8641', 'y', '3251', '1191', 't', 'x', 'z', '7203', 'b', 'b', '7545', '7283', 'z', 'y', '8127', 'x', 'l', '6251', 'y']

Ex Output:
b, c, e, f, h, l, o, t, x, y, z


Ex Input:
['d', 'q', 'o', '337', 'h', 'f', '4997', 'e', '7155', '4543', 'e', 't', 'o', '8743', 'l', 'u', '4565', 'v', 'i', 'q', '8615', 'd', 'z', '2741', 'c', 'q', '6919', '57', '469', '7725', 'o', '6697', 'b', '9925', 'b', 'f', 'r', '5207', 'f', '2915', 'n', '2059', '5591', 'p', 'u']

Ex Output:

b, c, d, e, f, h, i, l, n, o, p, q, r, t, u, v, z