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: yNuwnqBsSCMSttcxfDtHV

A: yNuwnqBsSCMtcxfDHV
****
Q: OIrNYBqClnipsOAEbYYImPKkBDq

A: OIrNYBqClnipsAEbmPKkD
****
Q: QFAWjYIbRIJWvLvKLmdNsW

A:
QFAWjYIbRJvLKmdNs
****