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]: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']
[A]: a, c, i, j, n, r, t, v, x


[Q]: ['2593', '1835', '5089', 'v', '9723', 'f', '9279', '4257', '2175', '655', 'q', 's', 'v', 'j', 'm', '4471', '6419', '1685', '2793', 'x', '509', 's', '4833', '2125', 'b', '6379', '1075']
[A]: b, f, j, m, q, s, v, x


[Q]: ['4877', 'z', 'o', '7563', 'i', '99', 'v', 'j', '3039', 'y', '7559', '9305', 'n']
[A]:
i, j, n, o, v, y, z