#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
using ll = long long;

int main(){
        int a,b;
        cin >> a >> b;
        a++;
        if(a<=b){
                cout << "YES\n" << b-a << endl;
        }
        else{
                cout << "NO\n" << a-b << endl;
        }
}