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:
['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']

Ex Output:
b, f, h, i, o, p, q, s, u, w


Ex Input:
['8739', 'v', 'm', '6277', 'l', 's', '109', '8057', '3835', 'd', 'u', 'f', 'w', 'd', 'p', '7705', '3643', '4455', 'u', 'p', 'u', '9407', 'g', 'w', '595', 'z', '6827', '6879', 'w', 'w', '6973', 'm', 'e', '1553', 'v', '3529', '8953', '3903', '5713', '8249', 'e', '1113', 'b', 't', 'r']

Ex Output:
b, d, e, f, g, l, m, p, r, s, t, u, v, w, z


Ex Input:
['r', '507', '2983', '5121', '2791', '3241', 't', '7559', '9585', '1473', '6047', 'l', '7389', '1975', 'd', 'k', 'i', '8039', '8663', '455', '3623', 's', '9685', '3713', 'g', 'x', 'o', 'p']

Ex Output:

d, g, i, k, l, o, p, r, s, t, x