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:
BeZEQbbgVZcjWBaojjCUQbZhonBH
answer:
BeZEQbgVcjWaoCUhnH


question:
urPUAGSMCdtYOaxOCmWXeaSdSZ
answer:
urPUAGSMCdtYOaxmWXeZ


question:
btxuUGwbmqGQQmnbzVxueefqReT
answer:

btxuUGwmqQnzVefRT