#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
int main() {
	int A, B;
	cin >> A >> B;
	if (A <= B - 1) {
		cout << "YES" << endl << abs(A + 1 - B);
	}
	if (A >= B){
		cout << "NO" << endl << abs(A + 1 - B);
		}

}