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: ['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']

A: a, b, c, d, f, h, i, m, o, s, u, x
****
Q: ['f', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']

A: a, c, f, g, h, m, n, s, w, y
****
Q: ['653', '9', 'i', '2801', 'g', '1045', 'a', '6399', '6735', '141', 'c', '7313', 'i', '8835', '5453', 'n', 's', 'v', '6259', '6107', '381', '5365', '5523', 'd', '4547', '7667', '8549', '3743', 'm', '9005', 'u', '2153']

A:
a, c, d, g, i, m, n, s, u, v
****