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

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

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