#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i ++)
using namespace std;


int main(){
    int a, b;
    cin >> a >> b;

    a ++;
    if(a >= b) cout << "YES\n0" << endl;
    else cout << "NO\n" << a - b << endl;
    return 0;
}