import java.util.Random;

class PersonTeacher implements Person {
  protected String name;
  private Random grader = new Random();
  private final int MAXGRADE = 5; 

  PersonTeacher() {
    name ="Nobody";
  }

  PersonTeacher(String name) {
    this.name = name;
  }

  public void say(String toSay) {
    System.out.println(name + " says: " + toSay);
  }

  public void introduceYourself() {
    say("Hi I'm " + name + ". I'm a Teacher. How are you doing?");
  }

  public void gradeStudent (String studentID) {
    int grade = grader.nextInt(MAXGRADE)+1;
    say("Dear student "+ studentID +" your grade is "+ grade);
  }

}