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:
['1121', 'j', '1433', 'g', 'l', '1479', '1699', 'j', 'a', '8507', 'd', 'a', '5229', 'k', 'x', '4549', 'e', 'p', '1367', 'u', 'd', '785', '215', 'e', 'f', 'a', '101', '7575', '7965', 'p', 'i', '5637', '1005', 'i', 'y', '181', 'r']

Ex Output:
a, d, e, f, g, i, j, k, l, p, r, u, x, y


Ex Input:
['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']

Ex Output:
b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y


Ex Input:
['v', '1897', '8077', '6377', '3957', '5919', 'e', '221', '4537', 'h', 'z', '2689', '1339', 's', '309', 'f', '9399', 'p', 'w', 'q', 'm', 'c', 'z', 'n', 'h', '1991', '1525']

Ex Output:

c, e, f, h, m, n, p, q, s, v, w, z