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:
['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

Ex Output:
b, d, f, m, o, p, r, v, x, y


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:
['u', '6977', 'b', 'w', '6421', '2425', '4145', '301', 'e', 'z', 'c', 'e', '3243', 'z', 'n', '3513', '263', 'm', 'w', '5179', '9133', 'x', '473', '6675', '2307', '7009', '9389', '2593', '9153', '3423', 'm', 'u', '2231', '6057', '5387', '2487', 's', 'j', '3703']

Ex Output:

b, c, e, j, m, n, s, u, w, x, z