#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 {
        cout << "NO" << endl;
        cout << a - b << endl;
    }
    return 0;
}