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]: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']
[A]: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


[Q]: ['a', 'i', '7725', '2483', 'e', 'j', '5337', 'b', '6835', '8231', 'm', 'v', 'a', '1475', 'n', '5823', 's', 'm', '7313', '2841', '2585', '4673', 'u', '2083', 'z', 'd', 'p', '2117', 'i', '587', 'i', 'a', '2527', '7967', '6567', 'n', '6145', 'r', 'f']
[A]: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z


[Q]: ['m', 'x', '9297', 'y', 'u', '9535', '1977', 'a', '9239', 'm', 'o', 'c', 'a', 'z', '9651', '8007', 'g', '2365', '6855', '5667', 't', 's', '2957', '9601', 'x', '15', 'p', '9923', 'f', 's', '5379', '7721', '1469', 'q', '2729']
[A]:
a, c, f, g, m, o, p, q, s, t, u, x, y, z