In this task, you are given a string of characters. You need to remove duplicate characters from the string if any, and return the resulting string.

Input: Consider Input: illrFjErfSgrAAErfKMlvbI

Output: ilrFjEfSgAKMvbI


Input: Consider Input: CwQBJjXAtwxJSVmjIScuDA

Output: CwQBJjXAtxSVmIcuD


Input: Consider Input: sHxKxkFrEYIoIHwnLijBD


Output: sHxKkFrEYIownLijBD