from math import *

a, b = map(int, input().strip().split())
for n in range(max(2,a), b+1):
	sqrtN = int(0.1 + sqrt(n))
	isPrime = True
	for p in range(2, sqrtN+1):
		if n%p == 0:
			isPrime = False
			break
	if isPrime:
		print(n)