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 class Stringable implements IFieldsToList{
  IF0<?> f;
  Stringable() {}
  Stringable(IF0<?> f) {
  this.f = f;}public Object[] _fieldsToList() { return new Object[] {f}; }

  public String toString() { return str(f == null ? null : f.get()); }
}
static String str(Object o) {
  return o == null ? "null" : o.toString();
}

static String str(char[] c) {
  return new String(c);
}




static interface IF0<A> {
  A get();
}
static interface IFieldsToList {
  Object[] _fieldsToList();
}

}