import java.util.Scanner;
public class Main {
public static char Grade(int a){
if(a>=90)
return 'A';
else if(90>a&&a>=80)
return 'B';
else if(80>a&&a>=70)
return 'C';
else if(70>a&&a>=60)
return 'D';
else
return 'E';
}
public static void main(String[] arg){
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
System.out.print(Grade(a));
}
}
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