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:
ymiDSDINLYJcPFTeXDVvWdA

Ex Output:
ymiDSINLYJcPFTeXVvWdA


Ex Input:
PgnuLHMWcjJVzGyJelrh

Ex Output:
PgnuLHMWcjJVzGyelrh


Ex Input:
ngGDcYbncvLyDvYspBnpiSDhWKg

Ex Output:

ngGDcYbvLyspBiShWK