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:
['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']

Ex Output:
a, b, c, j, l, r, t, v, x


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

Ex Output:
d, e, n, r


Ex Input:
['d', 'k', 'z', '1035', 'g', 'z', 'j', '2961', '6303', '691', 'f', 'v', '2433', 'n', 'q', 't', '6033', '4863', 'g', '9353', 'g', '9123', '4947', '5181', 'j', 'e', '2273', '5179', 'd']

Ex Output:

d, e, f, g, j, k, n, q, t, v, z