// Project: TerminalIO
// Module: gradecalculator
// Input class score, output course grade.

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {

        // Create scanner
        Scanner scanner = new Scanner(System.in);

        // Input class score:
        System.err.print("Input course grade: ");
        double score = Double.parseDouble(
                scanner.nextLine( ));

        // Compute and output course grade:
        String grade = "";
        if (score >= 89.5) {
            grade = "A";
        }
        else if (score >= 79.5) {
            grade = "B";
        }
        else if (score >= 69.5) {
            grade = "C";
        }
        else if (score >= 59.5) {
            grade = "D";
        }
        else {
            grade = "F";
        }
        System.out.println("The course grade is " +
            grade + ".");


        // Close scanner.
        scanner.close( );
    }
}