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]: ['6175', '9441', '7127', '5979', 's', '1367', 'e', 'm', '7083', '1787', '8375', '2851', '3475', 'r', '697', 'g', 'z', 'm', '4207', 'c', '7971', 'z', '9339', 'd', 's', '3507', '9003', 'i', 'y', 'w', 'j', 'i']
[A]: c, d, e, g, i, j, m, r, s, w, y, z


[Q]: ['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']
[A]: a, l, m, p, v, w, y


[Q]: ['1077', '8539', 'e', 'u', 'v', '4665', '7153', 'k', 'z', '5833', '6357', 'q', '1533', '6117', 'j', 'r', 'f', '5903', 'v', '5977']
[A]:
e, f, j, k, q, r, u, v, z