import java.util.Scanner;

public class GradeCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Prompt the user to enter a score
        System.out.print("Enter the score: ");
        int score = scanner.nextInt();

        // Determine the grade based on the score
        String grade;
        if (score >= 90 && score <= 100) {
            grade = "A";
        } else if (score >= 80 && score < 90) {
            grade = "B";
        } else if (score >= 70 && score < 80) {
            grade = "C";
        } else if (score >= 60 && score < 70) {
            grade = "D";
        } else if (score >= 0 && score < 60) {
            grade = "F";
        } else {
            grade = "Invalid score";
        }

        // Print the grade
        System.out.println("The grade is: " + grade);

        scanner.close();
    }
}