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: ngGDcYbncvLyDvYspBnpiSDhWKg

A: ngGDcYbvLyspBiShWK
****
Q: epiHXMnhjISahnEbtNxWTpi

A: epiHXMnhjISaEbtNxWT
****
Q: cwBQvgwEkNhVLIoizKkgpaphR

A:
cwBQvgEkNhVLIoizKpaR
****