Hackerrank : Day 12: Inheritance!

Problem Statement
Welcome to Day 12! Check out this video reviewing inheritance, or just jump right into the problem.
You are given two classes, Student and Grade, where Student is the base class and Grade is the derived class. Completed code for Student and stub code for Grade are provided for you in the editor. Note that Grade inherits all the properties of Student.
Complete the Grade class by writing a class constructor (Grade(String,String,int,int)) and a char calculate() method. The calculate method should return the characterrepresentative of a Student's *Grade. Score as defined in this chart:
Input Format
Input is already handled for you by the code pre-filled in the editor. There are 4 lines of input containing first name, last name, phone, and score, respectively.
Constraints 
4≤|first name|,|last name|≤10 
phone contains exactly 7 digits 
1≤score≤100
Output Format
Output is already handled for you by the code pre-filled in the editor. Your output will be correct if your Grade class constructor and calculate method are properly written.
Sample Input
 Heraldo
 Memelli
 8135627
 90
Sample Output
 First Name: Heraldo
 Last Name: Memelli
 Phone: 8135627
 Grade: O


Solution to this problem is :


import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

class Student{
   protected String firstName;
   protected String lastName;
   int phone;
   Student(String fname,String lname,int p){
         firstName=fname;
         lastName=lname;
         phone=p;
     
   }
   public void display(){// display the details of the student
       System.out.println("First Name: "+firstName+"\nLast Name: "+lastName+"\nPhone: "+phone);
   }

}


class Grade extends Student{
   private int score;
    String firstName, lastName;
    int phone;
   
    public Grade(String firstName, String lastName, int phone, int score){
        super(firstName, lastName, phone);
        this.firstName = firstName;
        this.lastName = lastName;
        this.phone = phone;
        this.score = score;
    }
       
   public char calculate()
       {
       if(score < 40)
           {
           return 'D';
       }
       else if ((40 <= score) && (score < 60))
           {
           return 'B';
       }
       else if ((60 <= score) && (score < 75))
           {
           return 'A';
       }
       else if ((75 <= score) && (score < 90))
           {
           return 'E';
       }
       else if ((90 <= score) && (score <= 100))
           {
           return 'O';
       }
else
{
    return 0;
}

   }
}



public class Solution {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String firstName=sc.nextLine();
        String lastName=sc.nextLine();
        int phone=sc.nextInt();
        int score=sc.nextInt();
        Student stu=new Grade(firstName,lastName,phone,score);
        stu.display();
        Grade g=(Grade)stu;
        System.out.println("Grade: "+g.calculate());
       
    }
}

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