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: kjynMHqaVPzfJDTnXNHz

A: kjynMHqaVPzfJDTXN
****
Q: uCgAmuuvjgNExaiRXxnvqSs

A: uCgAmvjNExaiRXnqSs
****
Q: wKewCMTAYgicAyjnUQXzhjthHFCe

A:
wKeCMTAYgicyjnUQXzhtHF
****