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:
['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']

Ex Output:
d, f, j, r, t, z


Ex Input:
['u', '4021', 'u', 'd', 'j', 'p', 'i', 'z', '3223', 'f', 's', 'l', 'p', 'd', '5031', '1059', '7875', '2097', 'q', 'i', '8813', '2017', 'h', 'l', 'y', '57', '1561', 'f', 'j', 'z', '1901', 'u', 'j', 'x', '6561', '9239', '3333', '8793', '4915', '5821', 'h', 'f', '765', 'x']

Ex Output:
d, f, h, i, j, l, p, q, s, u, x, y, z


Ex Input:
['6437', '923', '8747', 'd', 'g', 'i', 's', '6009', 'w', '2585', 'i', '6005', '183', 'i', '4681', 'v', '6667']

Ex Output:

d, g, i, s, v, w