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:
['4417', 'x', '4641', '885', '8485', 'd', '7057', '8519', 'm', 'i', 'l', '4627', '3069', 'v', '5011', 'u', '6673', 'h', '4541', 'j', '2337', '8175', '4797', 'f', '9109', 'q', 'q']

Ex Output:
d, f, h, i, j, l, m, q, u, v, x


Ex Input:
['c', '8389', 'j', '6113', '5843', 'f']

Ex Output:
c, f, j


Ex Input:
['1327', 'w', '5775', 'b', 'g', 'l', 'u', '6851', 't', 'v', 'k', 'x', '8343', '2747', 'a', '4477', '8809', 'a', '8665', 't', 'u', '5067', '9581', 'c', 'd', '8495', '9465', '863', 'y', '3393', 'r', '8545', '7855', 'f', 'g', 's', 'e', '8963', '2657', 'g', '1091', 'p']

Ex Output:

a, b, c, d, e, f, g, k, l, p, r, s, t, u, v, w, x, y