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: ['4451', 'e', 'v', '9353', '2737', '3811', '3971', '3121', '5025', '1809', 'j', 'j', '1387', 'n', '1267', 'k', 'l', 'r', '5733', '9193', '123']
A:
e, j, k, l, n, r, v