02

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.nextLine());
        int m = Integer.parseInt(sc.nextLine());
        int d = m - k;
        int[] array = new int[d + 1];
        for (int i = 0; i <= d; i++) {
            array[i] = k++;
        }
        for (int i = 0; i < array.length; i++) {
            if (array[i] % 3 == 0) System.out.println(array[i]);
        }
    }
}