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 Set<Class> classSuperclassesAndInterfaces(Class c) {
  if (c == null) return null;
  HashSet<Class> set = new HashSet();
  classSuperclassesAndInterfaces_find(c, set);
  return set;
}

static void classSuperclassesAndInterfaces_find(Class c, Set<Class> set) {
  do {
    if (!set.add(c)) return;
    for (Class intf : c.getInterfaces())
      classSuperclassesAndInterfaces_find(intf, set);
  } while ((c = c.getSuperclass()) != null);
}}