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

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int a, b;
    cin >> a >> b;

    string yes = "NO";
    int out = (a + 1) - b;

    if(out <= 0) {
        yes = "YES";
        out = 0;
    }

    cout << yes << '\n' << out << '\n';

    return 0;
}