/*
    No.780 オフ会
    https://yukicoder.me/problems/no/780
*/
#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

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

    if (a <= b) {
        cout << "NO" << endl;
        cout << abs(a - b) + 1 << endl;
    }
}