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: ['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']

A: b, e, n, t, y
****
Q: ['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']

A: a, b, e, j, l, n, p, r, t, u, w, x, y, z
****
Q: ['r', 'w', '9181', '355', 'g', 'e', '2615', '5599', 'r', 'l', 'm', 'm', 'j', 'p', '693']

A:
e, g, j, l, m, p, r, w
****