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]: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
[A]: a, b, e, h, i, j, k, n, s, u, v, w, y


[Q]: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']
[A]: b, d, i, p, r, t, u, v, w, y, z


[Q]: ['8625', '9357', 'c', '9087', 'r', 'h', '805', 's', 'j', '3101', 'c', '4331', 'h', 'n', '9915', 'f', '6383', '6497', 'e', '175', '4659', 'o', 'e', 'g', 'x']
[A]:
c, e, f, g, h, j, n, o, r, s, x