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

int main() {
  int a, b;
  cin >> a >> b;
  if (a < b) {
    cout << "YES\n" << (- a + b- 1) << endl;
  } else {
    cout << "NO\n" << (a - b + 1) << endl;
  }
  return 0;
}