#include <iostream>
#include <string>

using namespace std;

int
main() {
        int girl, boy;
        cin >> boy >> girl;
        if (boy+1 > girl) {
            cout << "NO" << endl;
            cout << boy - girl + 1 << endl;
        } else if (boy+1 <= girl) {
            cout << "YES" << endl;
            cout << girl - boy - 1 << endl;
        }
}