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:
['2181', '7019', 'l', 'z', 'z', 'y', '1245', '4179', '6951', '7249', '2723']

Ex Output:
l, y, z


Ex Input:
['j', '2805', 'b', '1527', '4351', 'y', '599', 'w', '6893', '807', '5987', 'x', '1687', 'k', '8091', 'o', '8217', 'i', '2963', 'm', 'x', '7787', '2655']

Ex Output:

b, i, j, k, m, o, w, x, y