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:
['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']

Ex Output:
g, i, l, m, o, r, s, y


Ex Input:
['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']

Ex Output:
a, b, g, l, r, s, t, w, y


Ex Input:
['y', '4781', 'w', 'i', 'x', '3271', 'k', '461', '8055', '4337', 'z', 'u', '2101', '2981', '6327', 'y', 'j', '7327', '401', 'm', 'z', 'i', '5361', '355', 's', 'g']

Ex Output:

g, i, j, k, m, s, u, w, x, y, z