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:
ysbPVZPTUdvimMzWIKPfyYIVrpGq
answer:
ysbPVZTUdvimMzWIKfYrpGq


question:
PkHwzoXRUCvjtJtXOXbcvzDJ
answer:
PkHwzoXRUCvjtJObcD


question:
uCgAmuuvjgNExaiRXxnvqSs
answer:

uCgAmvjNExaiRXnqSs