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:
OIrNYBqClnipsOAEbYYImPKkBDq
answer:
OIrNYBqClnipsAEbmPKkD


question:
SQBoeSRHVIZoNXohmlLcdefoCi
answer:
SQBoeRHVIZNXhmlLcdfCi


question:
kjynMHqaVPzfJDTnXNHz
answer:

kjynMHqaVPzfJDTXN