import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.imageio.*; import java.math.*; class main { static Iterator ll_iterator(A... a) { return iterator(ll(a)); } static Iterator iterator(Iterable c) { return c == null ? emptyIterator() : c.iterator(); } static List ll(A... a) { ArrayList l = new ArrayList(a.length); if (a != null) for (A x : a) l.add(x); return l; } static Iterator emptyIterator() { return Collections.emptyIterator(); } }