#include <bits/stdc++.h>
using namespace std;

int main() {
	int a, b;
	cin >> a >> b;
	a++;

	if (a == b) {
		cout << "YES" << endl;
		cout << 0 << endl;
	}
	else {
		int n = max(a, b) - min(a, b);
		cout << "NO" << endl;
		cout << n << endl;
	}
}