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.

Q: MaFQtjxhgyJaEoCighOAAgwhRmYdt

A: MaFQtjxhgyJEoCiOAwRmYd
****
Q: wrSaiSqvLVWTonDdYQMRvQVZajrYEw

A: wrSaiqvLVWTonDdYQMRZjE
****
Q: wKIctYCtBYzpKsWkMmflgQ

A:
wKIctYCBzpsWkMmflgQ
****