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 <A, B> List<Map<B, A>> mapToTwoElementMaps(B keyKey, B valueKey, Map<A, A> map) {
  List<Map<B, A>> l = new ArrayList();
  if (map != null) for (Map.Entry<A, A> e : map.entrySet())
    l.add(litorderedmap(keyKey, e.getKey(), valueKey, e.getValue()));
  return l;
}
static LinkedHashMap litorderedmap(Object... x) {
  LinkedHashMap map = new LinkedHashMap();
  litmap_impl(map, x);
  return map;
}


static HashMap litmap(Object... x) {
  HashMap map = new HashMap();
  litmap_impl(map, x);
  return map;
}

static void litmap_impl(Map map, Object... x) {
  if (x != null) for (int i = 0; i < x.length-1; i += 2)
    if (x[i+1] != null)
      map.put(x[i], x[i+1]);
}

}