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]: MjGSdmgICPfwZJpwblfTUaGUlJna
[A]: MjGSdmgICPfwZJpblTUan


[Q]: cwBQvgwEkNhVLIoizKkgpaphR
[A]: cwBQvgEkNhVLIoizKpaR


[Q]: DlmAHZNmehvEvkQpzINROIAZ
[A]:
DlmAHZNehvEkQpzIRO