#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
long long read() {
  long long x = 0, f = 1;
  char ch = getchar();
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    x = x * 10 + ch - '0';
    ch = getchar();
  }
  return x * f;
}
long long l, r;
int main() {
  l = read();
  r = read();
  cout << "YES" << endl;
  for (long long i = l; i <= r; i += 2) {
    cout << i << " " << i + 1;
    cout << endl;
  }
  return 0;
}
