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:
['1447', 'q', '9529', '2971', 's', '7351', '6753', '3493', 'v', 'c', 'x', '3097', '9145', 'b', 'e', 'b', '2967', '6933', 'e', 's', 'v', 'f', 'z', 'r']

Ex Output:
b, c, e, f, q, r, s, v, x, z


Ex Input:
['4045', '4739', 'd', 'e', '6789', 'e', 'q', '4909', '9511', 'h', '9543', '6725', 'a', '3683', 'q', 'k', 'd', 'q', 'z', 'b', '3245', '9877', '9155', '7751', 'e', '1015', '2379', 'f', 'y', '1121', '9801', 'c', 'h', 'l', 'f', '67', 'v', 'v', 'y', 'c', '3871', 'v', '5893', 'a']

Ex Output:
a, b, c, d, e, f, h, k, l, q, v, y, z


Ex Input:
['4315', 'i', 'i', '5313', '8659', '6487', 'g', 'v', 'd', 'e', 'm', 't', '2005', '6385', 'c', 'n', 'y', 'g', 'l', '8141']

Ex Output:

c, d, e, g, i, l, m, n, t, v, y