import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int low=sc.nextInt();
        int high=sc.nextInt();
        for (int n = low; n <= high; n++) {

             int c = 0;
             for (int div = 2; div * div <= n; div++) {
              if (n % div == 0) {
             c++;
                 break;
                    }
      }
      if (c == 0) 

        System.out.println(n);
    }
  }
}