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]: ['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']
[A]: a, b, d, e, h, i, j, l, m, n, t, u, v, z


[Q]: ['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']
[A]: b, v, y


[Q]: ['9441', 'a', '4421', 'n', 't', 'j', '4451', 'u', 'p']
[A]:
a, j, n, p, t, u