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: ITwcXZeghTDQLscvixOLpL

A: ITwcXZeghDQLsvixOp
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Q: huZGjSZbzraOBIBjsbJmLZ

A: huZGjSbzraOBIsJmL
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Q: SGvBKOxFygwFUJtrDQVhGvKOKAPtH

A:
SGvBKOxFygwUJtrDQVhAPH
****