class INT{}
class list<A>{
	A a = null;
	list<A>next = new list();
	void insert(A elem){
	     if(a = null){
	        a=elem;
	     }
	     else{
	       next.insert(elem);
	     }
	}
	void get(A elem){
	     
	     	System.out.println(elem);
             
	      next.get(elem);

	}
}

class main extends list<list<INT>> {
  
  list <INT>l = new list();
  void main(){
    list<INT>s= new list(), <INT>l = new list();
    INT i = new INT();
    }
}