#!/usr/bin/python
import math
a,b = map(int,raw_input().strip().split())
for i in range(a,b+1) :
	flag = 1
	for j  in range(2,int(math.sqrt(i)+1)):
		if i % j != 0:
			continue
		else:
			flag = 0
	if flag == 1:
		print i