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]: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']
[A]: b, d, f, h, p, t, u, w, x, y, z


[Q]: ['6997', '7937', '3593', '7807', '8789', 'd', 'q', '5129', '8033', '3847', 'y', '9491', 't', 'f', '4759', '4511', '2331', '8223', 's', '711', 'w', '1305', 'x', '8999', '7473', '3715', '1163', '1169', 'x', '787', 'l']
[A]:
d, f, l, q, s, t, w, x, y