import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class SampleInput {
	public static void main(String[] args) {
		String s ="";
		try{
			InputStreamReader isr = new InputStreamReader(System.in);
			BufferedReader br = new BufferedReader(isr);
			s = br.readLine();
		}catch(IOException e){
			
		}
		
		String aS = s.substring(0,s.indexOf(" "));
		String bS = s.substring(s.indexOf(" ")+1);
		
		int a = Integer.parseInt(aS);
		int b = Integer.parseInt(bS);
		
		for(int n = a; n <= b;n++){
			if(n % 3 == 0){
				System.out.println(n);
			}
		}
	}
}