//

import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		int a = sc.nextInt(); int b = sc.nextInt();
		
		System.out.println(a>b?"YES":"NO");
		System.out.println(Math.max(0, a-b+1));
		
	}
}