import java.util.Scanner;
public class Hello {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.print("Please enter the last grade: ");
		int lastGrade = scanner.nextInt();
		System.out.print("Please enter this grade: ");
		int thisGrade = scanner.nextInt();
		double promotion = 0.00;
		promotion = (double) (thisGrade-lastGrade)/lastGrade*100;
		if(thisGrade > lastGrade) {
			System.out.printf("恭喜，你本次成绩提升百分之：%.2f%%", promotion);
		}else {
			System.out.printf("再接再厉，你本次成绩并无提升，下降：%.2f%%", promotion);
		}
	}
}