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: jNMSbKjwKIdYhAaZRvVkcSniTpb

A: jNMSbKwIdYhAaZRvVkcniTp
****
Q: DWGwMXvmvHOwEgAzUgTuscqISGld

A: DWGwMXvmHOEgAzUTuscqISld
****
Q: XdpkpDFgCzvwuncTvKEPOS

A:
XdpkDFgCzvwuncTKEPOS
****
