#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <math.h>
#include <iomanip>

using namespace std;

int main(){
	int a,b;
	cin >> a >> b;
	a++;
	int ans=a-b;
	if(ans<0)ans=0;
	if(ans==0){
		cout << "YES" << endl << ans << endl;
	}else{
		cout << "NO" << endl << ans << endl;
	}
	return 0;
}