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:
CHIKoErswWcbipbgjjmyU

Ex Output:
CHIKoErswWcbipgjmyU


Ex Input:
hKTjUWnplikUoORBRCmJL

Ex Output:
hKTjUWnplikoORBCmJL


Ex Input:
WnEarWPNhRyvtQbwSubBUVr

Ex Output:

WnEarPNhRyvtQbwSuBUV