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:
['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']

Ex Output:
a, c, e, h, j, k, o, s, v, w, x, z


Ex Input:
['b', 'd', '8153', 'u', '3695', '5317']

Ex Output:
b, d, u


Ex Input:
['7095', '8515', 'h', 'd', '6883', '9171', 'o', '9939', '7287', 'p', 's', 'i', 'z', '305', 'g', '4103', 'w']

Ex Output:

d, g, h, i, o, p, s, w, z