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:
['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']

Ex Output:
e, g, j, l, n, q, r, s, t, v, x, y, z


Ex Input:
['7911', '7175', 'y', '9173', 'y', '2529', '831', 'k', '7197', 'j', '2343', 'i', 'b', '6799', '5987', '7277', 'n', 'x', 'h', '7209', 'l', 'd', 'm', 'e', '2277', '8909', 'x', '5361']

Ex Output:
b, d, e, h, i, j, k, l, m, n, x, y


Ex Input:
['5501', 'y', 'a', '8591', 'o', 'z', '3137', 'n', '8691', '7523', '3699', '617', '9691', '4441', '8365', '3805', 'c', '3125', 'e', '1827', 't', '621', '9099', 'z', '7909', '4905', 'o', 'w', 's', 'o', '5613', '9401', 'h', '9041', 'c', 'z', 'x', 'x', 'b', 'i', '5895', '4907', 'o', 'l', 'u']

Ex Output:

a, b, c, e, h, i, l, n, o, s, t, u, w, x, y, z