#include <iostream>
#include <string>

using namespace std;

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