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.

Q: ['u', '4021', 'u', 'd', 'j', 'p', 'i', 'z', '3223', 'f', 's', 'l', 'p', 'd', '5031', '1059', '7875', '2097', 'q', 'i', '8813', '2017', 'h', 'l', 'y', '57', '1561', 'f', 'j', 'z', '1901', 'u', 'j', 'x', '6561', '9239', '3333', '8793', '4915', '5821', 'h', 'f', '765', 'x']

A: d, f, h, i, j, l, p, q, s, u, x, y, z
****
Q: ['d', '4377', '9271', '8053', '9519']

A: d
****
Q: ['b', '1141', '1435', 'n', '9933', '9355', '4047', '215', '2893', '9229', 'q', '5199', 'u', '5675', '4035', '1647', 'b', '5789', '1459', '9863', 'h', '3335', 't']

A:
b, h, n, q, t, u
****