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:
['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']

Ex Output:
g, i, k, l, m, n, o, p, t, u, w, y


Ex Input:
['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']

Ex Output:
c, e, j, l, n, q


Ex Input:
['m', '5325', 'f', '6221', '2263', '4469', 'q', '2433', 'y', '6881', '9861', 'f', 'p', '7389', 'v', 'l', 'q']

Ex Output:

f, l, m, p, q, v, y