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:
['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:
['6185', 'a', 'v', '1843', '4987', 'h', '1113', 'f', 'j', '7487', '1651', '3981', '9479', 'a', '6279', '1583', '9653', 'h', '3779', 'b', 'x', '2491', '785', '6265', 't', '7547', '8867', '7017', 'i', '811', 'l', '8235', '9249', '2161', '3337', '7881', 'p']

Ex Output:

a, b, f, h, i, j, l, p, t, v, x