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:
['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']

Ex Output:
c, e, f, g, h, i, k, n, s, u, w, y, z


Ex Input:
['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']

Ex Output:
d, e, n, r


Ex Input:
['k', '9353', '3563', 'p', 'k']

Ex Output:

k, p