#include <iostream>
#include <string>
using namespace std;
typedef long long int ll;

int main(){
	ll a,b; cin >> a >> b;
	if(a>=b){
		cout << "NO" << endl;
		cout << a+1-b << endl;
	}
	else{
		cout << "YES" << endl;
		cout << 0 << endl;
	}
}