PrimeNum

import java.util.*;

public class PrimeNum {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int a = input.nextInt();
		int b = input.nextInt();

		  for(int i = a ; i <= b ; i++ ) {
		      if ( i == 2 || i == 3 ) System.out.println(i);
		      int root = (int) Math.sqrt(i);

		      for(int j = 2; j <= root ; j++ ) {
		          if ( (i % j) == 0 ) break;
		          if ( j == root ) System.out.println(i);
		      }
		  }
	}
}