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:
['z', 'h', '2065', '6773', 'v', '151', '8957', 't', 'l', 'j', '7867', 'v', '799', '9009', '4317', 'm', '6921', 'r', '1245', '5637', 'x', '4465', 'f', 'y', '3549', 'e', 'f', 'm', 't', '6281', '4241', '3415', 'z', 'g']

Ex Output:
e, f, g, h, j, l, m, r, t, v, x, y, z


Ex Input:
['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']

Ex Output:
a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


Ex Input:
['5883', 'y', '7027', 'e', '8195', 'x', '6715', 'd', 'v', '8783', 'b', 'm', '77', '7297', 'v', 't', '9917', '6589', '5881', 'u', 'l', 'z', 'a', '4897', '4435', 'a', 'o', '901', 'f', 'v', '2913', 'w']

Ex Output:

a, b, d, e, f, l, m, o, t, u, v, w, x, y, z