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:
['3411', 'a', 'v', 'j', '8925', '909', 'h', 'l', 'r', '1371', 'u', '7789', '4813', 'u', 'q', 'i', '8473', 'n', '7191', 'c', '4641', 'e', '5107', 'q', 'z', 't', '105', 'q']

Ex Output:
a, c, e, h, i, j, l, n, q, r, t, u, v, z


Ex Input:
['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']

Ex Output:
b, e, f, g, k, l, n, q, v, w, y


Ex Input:
['v', '3801', 'w', '4987', '7247', '8557', '6469', '7725', 'h', 't', '641', '7073', '3247', '987', 'n', 't', '6425', '6165', '7847', '7233', '4517']

Ex Output:

h, n, t, v, w