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]: PWCZyDfWSclWzumLWJJIFSxDMUGR
[A]: PWCZyDfSclzumLJIFxMUGR


[Q]: yNuwnqBsSCMSttcxfDtHV
[A]: yNuwnqBsSCMtcxfDHV


[Q]: YaAEgLQiLAQPSIyqychKmSsauUkMw
[A]:
YaAEgLQiPSIyqchKmsuUkMw