import java.util.Scanner;
public class yukicoderNo780 {
    
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		int dansi = sc.nextInt();
		int josi = sc.nextInt();

		if( dansi + 1 <= josi )
		{
			System.out.println( "YES" );
			System.out.println( josi - dansi - 1 );
		}
		else
		{
			System.out.println( "NO" );
			System.out.println( dansi + 1 - josi );
		}
	}
}