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: ['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']

A: b, d, e, g, h, i, j, w, y
****
Q: ['2409', 'q', 'w', 'e', 'x', '4737', 'w']

A: e, q, w, x
****
Q: ['5135', 'z', 'u', 'n', 'd', '5155', '1505', 'd', 'm', '2625', 'x']

A:
d, m, n, u, x, z
****