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]: ['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']
[A]: c, e, j, l, o, q, w, z


[Q]: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']
[A]: d, h, i, j, k, n, o, t, v, w, x, z


[Q]: ['4793', '2041', '9811', '7441', '6443', '2749', 'o', '9541', '5629', '6817', 't', 'g', '5591', '7261', 'e', '1489', 'u', 'a', '5725', 'y', '1463', '3827', 't', '89', 'j', 'a', 'w', '4497', 'd', 'p', '9089', '9333', 'h', '6383', 'e', 'u', 'g', '6215', 'f']
[A]:
a, d, e, f, g, h, j, o, p, t, u, w, y