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:
['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']

Ex Output:
c, e, h, k, p, q, u, v, y


Ex Input:
['w', 'n', '729', '2491', 'n', 'x', '915', '1869', 'z', '8491', '9947', '561', '829', 'n', 't', 'i']

Ex Output:
i, n, t, w, x, z


Ex Input:
['u', '1487', '395', 'h', '5681', '2421', 'a', 'a', 'v', '4683', '5003', '9139', 't', '1913', '4623', 'u', '8543', 'l', '7577', '5541', 'u', '4103', 'k', 's', '2511', 'j']

Ex Output:

a, h, j, k, l, s, t, u, v