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:
['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']

Ex Output:
a, c, e, h, l, q, t, v, w, x


Ex Input:
['5971', 'x', 'c']

Ex Output:
c, x


Ex Input:
['1925', '8025', 'v', 'e', 'y', '4883', 'p', 'r', '8621', 'j', 'a', '2503', '7239', '163', 'n', '1535', '1213', '1933', '4675', '3267', '6627', 'i', '431', '2735', '6487']

Ex Output:

a, e, i, j, n, p, r, v, y