class List {
 int number;
 List next;

  List(int num, List n) {
    number=num;
    next=n;
  }
}

class ListProgram {  
  public static void print(List l) {
    while (l!=null) {
      System.out.println(l.number);
      l=l.next;
    }
  }

  public static void main (String args[]) {
    List f,g;

    f=new List(4,null);
    g=new List(7,null);
    g.next = f;
    print(g);
  }
}