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:
dtwJlkEpgjUfBVBUvNlYwbEQVq

Ex Output:
dtwJlkEpgjUfBVvNYbQq


Ex Input:
DWGwMXvmvHOwEgAzUgTuscqISGld

Ex Output:
DWGwMXvmHOEgAzUTuscqISld


Ex Input:
CDcnHTHNKVZUuThezXQbxTX

Ex Output:

CDcnHTNKVZUuhezXQbx