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: PxUaJWAyOQWYxYpOHuccQUtHoJOV

A: PxUaJWAyOQYpHuctoV
****
Q: YaAEgLQiLAQPSIyqychKmSsauUkMw

A: YaAEgLQiPSIyqchKmsuUkMw
****
Q: ktWYQIoDdqxfApnOvFWSAhj

A:
ktWYQIoDdqxfApnOvFShj
****
