//條件表達式的應(yīng)用
import java.util.*;
public class TiaoJian
{
	public static void main(String[] args)
	{
		Scanner reader=new Scanner(System.in);
		while(reader.hasNextInt())
		{
			int a=reader.nextInt();
			char M;
			M=(a<90)?((a>=60)?'B':'C'):'A';
			System.out.println("該分數(shù)屬于"+M+"等");
		}
	}
}