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]: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
[A]: c, d, e, f, l, n, p, q, t, u, v, y


[Q]: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']
[A]: d, f, j, r, t, z


[Q]: ['k', 'i', 's', '463', 'c', '3497', 'v', 'h', '9771', '4817', '369', '4215', 'n', 't', '5103', '7555', '2099', 'k', 'q', '4445', 'd', 'b', '4383', 'a', 'f', '9025', 'z', 'n', 'r', 'z', 's', 'k', 'e']
[A]:
a, b, c, d, e, f, h, i, k, n, q, r, s, t, v, z