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:
PxUaJWAyOQWYxYpOHuccQUtHoJOV

Ex Output:
PxUaJWAyOQYpHuctoV


Ex Input:
tOjAVemnYuDKuvgyhlOuFwxJb

Ex Output:
tOjAVemnYuDKvgyhlFwxJb


Ex Input:
sxdVYpEhCfPCWBjPvEhqYcf

Ex Output:

sxdVYpEhCfPWBjvqc


