import java.util.Scanner;
public class Main {
	public static void main(String[]args) {
		Scanner sc = new Scanner(System.in);
		int man = 0,woman = 0,x = 0;
		man = sc.nextInt();
		man ++;
		woman = sc.nextInt();
		if(man == woman) {
			System.out.println("YES");
			System.out.println(0);
		}else{
			System.out.println("NO");
			if(man < woman ) {
				x = woman - man;
				System.out.println(x);
			}else{
				x = man - woman;
				System.out.println(x);
			}
		}

	}
}