import java.util.Scanner;

public class No780 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int A = s.nextInt();
		int B = s.nextInt();
		s.close();
		if(A + 1 <= B){
			System.out.println("YES");
			System.out.println("0");
		}else{
			System.out.println("NO");
			System.out.println(A + 1 -B);
		}

	}

}