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: BmZfcKxvgfSmDoWSwSIxT

A: BmZfcKxvgSDoWwIT
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Q: illrFjErfSgrAAErfKMlvbI

A: ilrFjEfSgAKMvbI
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Q: XlORwpLaOXJqdmPwplBzGrj

A:
XlORwpLaJqdmPBzGrj
****