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]: sZSPsCZeZilgLkWQtnAsec
[A]: sZSPCeilgLkWQtnAc


[Q]: PgnuLHMWcjJVzGyJelrh
[A]: PgnuLHMWcjJVzGyelrh


[Q]: ZJRrdhPmcXwKgJTuvFEEpLx
[A]:
ZJRrdhPmcXwKgTuvFEpLx