import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int m = Integer.parseInt(sc.next()) + 1;
    int f = Integer.parseInt(sc.next());
    if(m >= f) {
        System.out.println("YES");
        System.out.println(0);
    } else {
        System.out.println("NO");
        System.out.println(m - f);
    }
  }
}