#include <iostream>

using namespace std;

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

    if ((a + 1) == b) {
        cout << "YES\n";
        cout << "0\n";
    } else {
        cout << "NO\n";
        cout << max((a + 1), b) - min((a + 1), b) << '\n';
    }
}