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.

['907', '2407', '1385', '3593', 'x', '4143', '2271', '8361', 'q', '5093', 'd', '257', 'm', 'a', '5751', '7845', '3925', '3517', '7753', 'e', '5803', '2629', 't', 'e', '845', '6157', '9787', '225', 'j', 'j', 'l', '1321', 'k', '2459', 'u', '9113', '3193', 'a', 'j', 't']
a, d, e, j, k, l, m, q, t, u, x

['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, b, d, e, f, i, j, m, n, p, r, s, u, v, z

['8943', '5995', '5785', 'f', '1053', '2087', '7133', 'g', '3325', '6347', '4183', 'u', '2253', '5163', 'e', 'o', 'h', 'g', 'k', 's', '2283', '1245', 'e', '1379', '4741', 'i', '2399', 'a', '9403', '1649', 'f', 'a', 'q', '8589', '7885', '3421', '4461', 't', '9059', 'b', 'j', 'o']

a, b, e, f, g, h, i, j, k, o, q, s, t, u