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.*;
// virtual view into a list that with a "gap" (elements in the middle being removed)
class main {

static <A> List<A> lineComp_listWithGap(List<A> l, int copyTo, int copyFrom) {
  if (copyFrom == copyTo) return l;
  return new RandomAccessAbstractList<A>() {
    int size = l.size()-(copyFrom-copyTo);
    public int size() { return size; }
    public A get(int i) {
      return l.get(i < copyTo ? i : i+(copyFrom-copyTo));
    }
  };
}
abstract static class RandomAccessAbstractList<A> extends AbstractList<A> implements RandomAccess {
}
}