#include <iostream>
#include <string>

using namespace std;

int main() {
int n,a,b;
int p,q;
cin >>a>>b;
 for(n=a;n==b+1;n++){
     p=n/10;
     q=n%10;
     if(p==3||q==3||n%3==0){
         cout<<n<<endl;
         continue;
     }
 }
 
 
return 0;    
}