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.

Input: Consider Input: EJBeIJMJeQDbzsfHyboQYmMTwAymEy

Output: EJBeIMQDbzsfHyoYmTwA

Input: Consider Input: CfmnulCVWZeALbyeFhhMplKwLlUb

Output: CfmnulVWZeALbyFhMpKwU

Input: Consider Input: FADtggVHWPgSKcVnyvGF
Output: FADtgVHWPSKcnyvG