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:
osRkjysAYNKHZYSWIEORxnZJWf
answer:
osRkjyAYNKHZSWIEOxnJf


question:
czewqqMLGCBKQLVGDtng
answer:
czewqMLGCBKQVDtng


question:
sxdVYpEhCfPCWBjPvEhqYcf
answer:

sxdVYpEhCfPWBjvqc