instruction:
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.
question:
DmWHbaDBQZdQpXVeMeiml
answer:
DmWHbaBQZdpXVeMil


question:
XdpkpDFgCzvwuncTvKEPOS
answer:
XdpkDFgCzvwuncTKEPOS


question:
FwkSbZVdSEKTcqFfDKxzzRi
answer:

FwkSbZVdEKTcqfDxzRi