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: eSfCVZsCDnsQYKZLJZknwVEUHre

A: eSfCVZsDnQYKLJkwEUHr
****
Q: UjLmtcNFWOcqWdjClGGYxdbR

A: UjLmtcNFWOqdClGYxbR
****
Q: otAOfRQAOUdHhTAHqSaDvPql

A:
otAOfRQUdHhTqSaDvPl
****