import java.util.Scanner;
public class No_207 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int x = a/3;
		int y = b/3;
		if (a%3==0){
			for(int k=x; k<=y; k++){
			System.out.println(3*k);
		    }
		}else{
			for(int l=x+1; l<=y; l++){
			System.out.println(3*l);
		    }
	    }
	}
}