import java.util.Scanner;

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