//
//	goal: read a numeric score, and out
//				the letter score

import java.util.Scanner;
public class Convert
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		double score;
		System.out.print("Your score: ");
		score = input.nextDouble();

		if(score<0 || score>100)
			System.out.println("Invlid input.");
		else if(score>=89.5 && score<=100)
			System.out.println("A");
		else
			System.out.println("Not A");
	}
}