import math
num=map(int,raw_input().strip().split())
num1=int(num[0])
num2=int(num[1])
if num1>num2:
	temp=num1
	num1=num2
	num2=temp
i=num1
while i<=num2:
	j=2
	k=int(math.sqrt(i))
	while j<=k:		
		if i%j==0:break
		j+=1
	if j>k:print i
	i+=1