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:
MaFQtjxhgyJaEoCighOAAgwhRmYdt

Ex Output:
MaFQtjxhgyJEoCiOAwRmYd


Ex Input:
CHIKoErswWcbipbgjjmyU

Ex Output:
CHIKoErswWcbipgjmyU


Ex Input:
hwuafkzTfllMQgESKLgjUY

Ex Output:

hwuafkzTlMQgESKLjUY