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:
['6597', '7889', 'x', 'v', 'm', 'j', 'j', 'w', 'v', '177', 'x', '8353', '5897']

Ex Output:
j, m, v, w, x


Ex Input:
['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']

Ex Output:
a, b, d, e, j, k, m, n, o, p, q, u, v, w, x


Ex Input:
['t', 'm', '8273', 'z', 'u', '3959', 'o', 'r', '6679', 'i', '6351', '631', 'a', 'v', 'd', 'e', 'x', 'w', 'h', 'x', 'l', 'h', '9587', '5049']

Ex Output:

a, d, e, h, i, l, m, o, r, t, u, v, w, x, z