Detailed Instructions: 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: ['9769', 'x', '4611', '2825', 'e', 'z', '4067', '7545', 'z', 't', 't', 'p', 'b', 'i', 'v', '2343', 't', 'k', '37', '215', '4393', 'k', 'h', '7691', '9359', 'j']
A:
b, e, h, i, j, k, p, t, v, x, z