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import java.text.CharacterIterator;
import java.text.StringCharacterIterator;
public class Main {
private static final String text = "this is a test";
public static void main(String[] args) {
CharacterIterator it = new StringCharacterIterator(text);
for (char ch = it.last(); ch != CharacterIterator.DONE; ch = it.previous()) {
System.out.print(ch);
}
}
}
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