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 List wrapArrayAsImmutableList(Object array) {
  if (array == null) return null;
  if (array instanceof Object[])
    return wrapObjectArrayAsImmutableList((Object[]) array);
  else
    return wrapPrimitiveArrayAsImmutableList(array);
}
static <A> List<A> wrapObjectArrayAsImmutableList(A[] array) {
  if (array == null) return null;
  int n = Array.getLength(array);
  return new RandomAccessAbstractList<A>() {
    public int size() { return n; }
    public A get(int i) { return array[i]; }
  };
}


static List wrapPrimitiveArrayAsImmutableList(Object array) {
  int n = Array.getLength(array);
  return new RandomAccessAbstractList() {
    public int size() { return n; }
    public Object get(int i) { return Array.get(array, i); }
  };
}




abstract static class RandomAccessAbstractList<A> extends AbstractList<A> implements RandomAccess {
}

}