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.

[EX 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']
[EX A]: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z

[EX Q]: ['5293', '2211', 'r', 'j', 'x', 'y', 'u', 'n', 'r', 'l', 'v', '113', 'v', 'e', '1323', '6291', 'a', '7417', 'j', '4175', 'd', '855', 'z', '1123']
[EX A]: a, d, e, j, l, n, r, u, v, x, y, z

[EX Q]: ['2171', '1867', 'm', '9463', '8937', 'l', 'i', '9455', '4045', '4835', 'f', '4265', 'f', 'x', 'c', 'x', 'c', 'w', 'm', 'v', 'j', '6255', 'u', 'p', '263', '2899', 'j', '1475', '8075']
[EX A]:
c, f, i, j, l, m, p, u, v, w, x