class One {
  public static void main(String[] args) {
    Point a = new Point(3, 0); 
    Point b = new Point(0, 4); 
    // System.out.println(a.talk()); 
    System.out.println(a.distanceTo(b)); 
    System.out.println((new Point(1, 1)).distanceTo(new Point())); 

    a = new Point(1, 1); 
    b = new Point(); 

    System.out.println(a.distanceTo(b)); 


    Line c = new Line(new Point(0, 0), new Point (1, 1)); 
    System.out.println(c.length()); 


  }
}

class Line {
  Point start;
  Point end; 
  Line() { 

  } 
  Line(Point a, Point b) {
    this.start = a; 
    this.end = b; 
  } 
  double length() {
    return start.distanceTo(end); 
  } 
}