import java.util.Scanner;

public class GradingSwitchProgram {
	public static void main(String[] args) {
		char		letter;
		Scanner		keyboard = new Scanner(System.in);

		// Get the user input
		System.out.print("Enter the grade: ");
		letter = keyboard.next().charAt(0);

		switch(letter) {
    			case 'A': System.out.println("80% - 100%"); break;
    			case 'B': System.out.println("70% - 79%"); break;
    			case 'C': System.out.println("60% - 69%"); break;
    			case 'D': System.out.println("50% - 59%"); break;
    			case 'F': System.out.println("0% - 49%"); break;
    			default:  System.out.println("not defined");
		}
	}
}