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:
['w', '8777', 'y', 'e', '8015', 't', 'w', '53', '9149', 'e', 'k', '1837', 'b', 's', '4007', '4905']

Ex Output:
b, e, k, s, t, w, y


Ex Input:
['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']

Ex Output:
b, c, d, e, j, k, l, p, s, t, u, w, y


Ex Input:
['6317', '6035', '8197', 'u', 'l', '5643', 'q', 'd', 'h', '8585', 'g', '123', '1219', '4497', '7239', 'd', '1489', '1379', 'r', 'k', 'y', '7965', 'e', 'w', '8229', 'i', '1851', '9865', '9601', 'l', 'm', 'x', '2329', 'm', 'q', '999', '663', '1917', '1617', '6531', 'i']

Ex Output:

d, e, g, h, i, k, l, m, q, r, u, w, x, y