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.

['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']
f, h, j, n, u, w

['g', '4165', 'n', 'w', 'n', 'e']
e, g, n, w

['1809', 'y', '6321', '9473', 'v', 'x', 'h', '2361', '3629', '7181', 'q', '3735', '7009', '2505', '3465', 'u', '8081', '775', '4049', '5553', '3291', '8971', '6985', 't', 'c', '1643', 'y', 'v', '157', '9065', '303', '5569', 'e', 'q', 'w', '3385', 'v']

c, e, h, q, t, u, v, w, x, y