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: vpNNpsyAnsFJkHvrjgSkTOhHXIC

A: vpNsyAnFJkHrjgSTOhXIC
****
Q: NmtgUlgBDHQDBjDaXxen

A: NmtgUlBDHQjaXxen
****
Q: MirMnkVPsSbLhzcSGFXg

A:
MirnkVPsSbLhzcGFXg
****