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

int main() {
  int A, B; cin >> A >> B;
  if(A+1 <= B){
    cout << "YES" << endl << 0 << endl;
  }else{
    cout << "NO" << endl << max(A,B)-min(A,B)+1 << endl;
  }
}