interface Iterator {
  public boolean hasNext();
  public Object next();
}

class Interval implements Iterator {
  private int i;
  private int n;
  public Interval(int l, int u) { i = l; n = u; }
  public boolean hasNext() { return (i <= n); }
  public Integer next/*1*/() { return new Integer(i++); }
  // bridge
  public Object next/*2*/() { return next/*1*/(); }
}