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:
pKZWKxZqQdaAHUrMTJMYiZhu

Ex Output:
pKZWxqQdaAHUrMTJYihu


Ex Input:
NOXIdIppfrgUFWCgdPvNqsZOjPxB

Ex Output:
NOXIdpfrgUFWCPvqsZjxB


Ex Input:
BeZEQbbgVZcjWBaojjCUQbZhonBH

Ex Output:

BeZEQbgVcjWaoCUhnH


