import java.lang.RuntimeException;

//to represent an empty list of phone entries
public class MtPhList implements IPhList{ 
  public MtPhList() {}

  // represent this list as a string
  public String toString(){ 
    return new String("new MtPhList()");
  }

  //remove the first phone entry with the given name from this list
  public IPhList remove(String name){ 
    throw new RuntimeException("item to remove it's not in the list"); 
  } 

}