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]: SwUTgAzgSuHxHiuLjUMlBpkqrU
[A]: SwUTgAzuHxiLjMlBpkqr


[Q]: SIZayKTLqjQMnNpPLFVRhnPVyHXlxY
[A]: SIZayKTLqjQMnNpPFVRhHXlxY


[Q]: osRkjysAYNKHZYSWIEORxnZJWf
[A]:
osRkjyAYNKHZSWIEOxnJf