#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c[1234567], d, e, i, j, n;
  map<long long, long long> m;
  string s;
  cin >> a >> b;
  cout << "YES" << endl;
  for (i = a; i <= b; i += 2) {
    cout << i << " " << i + 1 << endl;
  }
}
