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: kjynMHqaVPzfJDTnXNHz

A: kjynMHqaVPzfJDTXN
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Q: rBeRPfuOhSCAIkgalGBywtdRPxi

A: rBeRPfuOhSCAIkgalGywtdxi
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Q: VvJOtngcPFHQbsCapwskMRDlRDVZk

A:
VvJOtngcPFHQbsCapwkMRDlZ
****