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.

[EX Q]: HuYHfZxsdwtzapmLmmFunDczqY
[EX A]: HuYfZxsdwtzapmLFnDcq

[EX Q]: QuMNYgXJKXvbSqRhUHAfsIAxqUYb
[EX A]: QuMNYgXJKvbSqRhUHAfsIx

[EX Q]: XjRLBIuGSzGcqVUCMPmbiFBnjKR
[EX A]:
XjRLBIuGSzcqVUCMPmbiFnK