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: HaddRfDDTMuuYNqxfFpkUUxgu

Output: HadRfDTMuYNqxFpkUg


Input: Consider Input: AHlQzXpVOwzImnUxPwSG

Output: AHlQzXpVOwImnUxPSG


Input: Consider Input: sFOaSQTXRZRCwzaBgYcgIi


Output: sFOaSQTXRZCwzBgYcIi