#include <stdio.h>
int main(void){
	int boy,girl;
	scanf("%d%d",&boy,&girl);
	
	if(boy + 1 == girl){
		printf("YES\n0");
	}else if(boy + 1 > girl){
		printf("NO\n%d",(boy + 1) - girl);
	}else if(boy + 1 < girl){
		printf("YES\n%d",girl - (boy + 1));
	}
}