#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
const int MX = 1e5 + 6;
long long l, r;
int main() {
  cin >> l >> r;
  puts("YES");
  for (long long i = l; i <= r; i += 2) cout << i << " " << i + 1 << endl;
  return 0;
}
