#include <bits/stdc++.h>
using namespace std;
int main() {
  long long c = 0, d = 0, i;
  cin >> c;
  cin >> d;
  cout << "YES\n";
  for (i = c; i <= d; i = i + 2) {
    cout << i << " " << i + 1 << "\n";
  }
  return 0;
}
