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:
plpzTuEtlZcteRrekofKr

Ex Output:
plzTuEtZceRrkofK


Ex Input:
hyRBumMJLvVnUJCVvrXaNEaR

Ex Output:
hyRBumMJLvVnUCrXaNE


Ex Input:
yYJPkPxbdrLHtYbiMfUGDNB

Ex Output:

yYJPkxbdrLHtiMfUGDNB