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.

Ex Input:
OIrNYBqClnipsOAEbYYImPKkBDq

Ex Output:
OIrNYBqClnipsAEbmPKkD


Ex Input:
ysbPVZPTUdvimMzWIKPfyYIVrpGq

Ex Output:
ysbPVZTUdvimMzWIKfYrpGq


Ex Input:
SIxnECIKwIXLdOZgaLINOWEYzygDx

Ex Output:

SIxnECKwXLdOZgaNWYzyD