Detailed Instructions: 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: ['5223', '8001', '3485', '9035', 'q', '3727', '4727', '4747', '2031', 'n', 'f', 'x', 'o', 'b', '7165', 'x', '2393', '9101', 'x', 'z', '1145', 'l', '2131', 's', '713', 'y', '567', '6485', '131', '7373', '8873', '897', 'n', '101', '285', 's', '4627', '8115', 'b', '9003', '3413', '8709', 'z']
A:
b, f, l, n, o, q, s, x, y, z