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:
['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']

Ex Output:
f, l, r, w, x, z


Ex Input:
['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']

Ex Output:
g, h, k, m, n, q, t, u, v, w, x


Ex Input:
['8485', 'x', '6465', '6429', '4111', 'v', '6901', 'z', 'n', '2623', 'c', '8681', '1011', 'k', '3349', 'o', '105', 'q', 'o', '3721', '8191', 'o', 'v', '3163', 'n', 'h', 'k', '947', '3113', 'f', '1087', 'c']

Ex Output:

c, f, h, k, n, o, q, v, x, z