import java.util.Iterator;
import java.util.LinkedHashSet;
public class Main {
public static void main(String[] args) {
LinkedHashSet lhashSet = new LinkedHashSet();
lhashSet.add(new Integer("1"));
lhashSet.add(new Integer("2"));
lhashSet.add(new Integer("3"));
Iterator itr = lhashSet.iterator();
while (itr.hasNext()){
System.out.println(itr.next());
}
}
}