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:
['4653', 'e', 'c', 'j', '6739', '3963', 'q', '4649', 'v', 's', 'j', '9757', '8075', '6253', '4365', 's', '9101', 'd', '6989', 't', '5687', '7389', '139', '4029', '5073', 'q', 'e', '2455', '1075', 'j', '1329', 'l', '4689', 't', 'z', '4179', 's', 'l', 'w', 'n', '6569', '8907', 'v', '605', 'y']

Ex Output:
c, d, e, j, l, n, q, s, t, v, w, y, z


Ex Input:
['b', 'a', '7411', '4471', 'z', 'l', '2051', 'q', '6749', '8647', 's', 'y', 'h', '9319', 'e', '5419', 'y', 'q']

Ex Output:
a, b, e, h, l, q, s, y, z


Ex Input:
['u', 'n', '2283', 'a', 'e', 'q', '4861', 'j', '7807', '5473', 'v', '9265', 'x', '2123', '9851', 'g', '8599', 'y', 'l', '85', 'z', 'f', '103', '2421', '9727', '7693', '6241', '5499', 'c', 'f', 'e', 'v', 'o', 'z', 's', 'x', 'z', 'v', '2737', 'e', '717']

Ex Output:

a, c, e, f, g, j, l, n, o, q, s, u, v, x, y, z