#include <iostream>
using namespace std;

int main() {
    int people[2];
    cin >> people[0] >> people[1];

    if (people[0]+1 == people[1]) {
        cout << "YES" << endl;
        cout << 0 << endl;
    } else if (people[0]+1 > people[1]) {
        cout << "NO" << endl;
        cout << people[0]+1 - people[1] << endl;
    } else if (people[0]+1 < people[1]) {
        cout << "YES" << endl;
        cout << people[1] - (people[0]+1) << endl;
    }
    return 0;
}