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]: ['491', '229', 'g', '6677', '4793', 'h', 'x', 'a', '2333', 'u', 'l', '785', 'p', '7331', '653', '5193', '5415', '8417', 'v']
[A]: a, g, h, l, p, u, v, x


[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]: ['7461', 'n', 't', 'k', '4025', '2507', 'i', 'c', '4649', '4949', '9435', 'n', '5257', 'e', '7141', 'l', 'n', 't', '1493', 'k', '4697', '3509', '143', 'c', 'n', 'g', '6917', '6591', 'b', 'k', 'f', '5323']
[A]:
b, c, e, f, g, i, k, l, n, t