cf 1051B

#include <bits/stdc++.h>
using namespace std;
#define test int t; cin>>t; while (t--)
#define ll long long int
#define fellow_junior  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int main()
{
   fellow_junior

   ll a,c,d,e,f,i,j,k,l;
   cin>>a>>c;
   cout<<"YES"<<endl;
   for(i=a;i<=c;i+=2)
   {
       cout<<i<<" "<<i+1<<endl;
   }

   return 0;
}