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: yxTlQSKsXczzwVbftQmlSyDnudusMZ

A: yxTlQSKsXczwVbftmDnudMZ
****
Q: ptUIcSNsiRtUWfLGkAOAf

A: ptUIcSNsiRWfLGkAO
****
Q: jahTEjtKeQFovsaqPtcjuJdRKkQL

A:
jahTEtKeQFovsqPcuJdRkL
****
