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:
['6143', 'y', '5505', '9813', 'r', 'v', 'u', '8681', '2387', 'u', 'o', 'm', '9793', 'm']

Ex Output:
m, o, r, u, v, y


Ex Input:
['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']

Ex Output:
b, e, g, h, k, m, q, u, w, y


Ex Input:
['p', '5319', 'z', 'x', 'd', 'z', '8559', 'j', 'h', '6309', 'o', '6373', 'y', 'v', 'j', '4507', 'o', 'j', 'y', '733', 'r', '11', '4585', 'a', '2335', 'r']

Ex Output:

a, d, h, j, o, p, r, v, x, y, z