Grade calculator - monolithic

# Monolithic program
def main():
    print("Welcome to the Student Grade Calculator!")

    while True:
        student_name = input("Enter student name (or type 'exit' to quit): ")

        if student_name.lower() == 'exit':
            print("Goodbye!")
            break

        student_score = input("Enter student score: ")
        student_score = int(student_score)

        if 90 <= student_score <= 100:
            student_grade = "A"
        elif 80 <= student_score < 90:
            student_grade = "B"
        elif 70 <= student_score < 80:
            student_grade = "C"
        elif 60 <= student_score < 70:
            student_grade = "D"
        else:
            student_grade = "F"

        print(f"Student {student_name} scored {student_score} and received a grade of {student_grade}.")

if __name__ == "__main__":
    main()