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:
['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:
['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']

Ex Output:
b, v, y


Ex Input:
['9911', '9837', '673', 'k', '6001', '9917', '7485', 'u', 'y', 'c', '4041', '6221', 'o', 'r', '6961', 'o', '1705', '3833', '5179', 'v', '5263', '6107', '3259', 'q', '4435', 'k', '901', 'h', 'l']

Ex Output:

c, h, k, l, o, q, r, u, v, y