s=map(int,raw_input().strip().split())
leap = 1
from math import sqrt
from sys import stdout
for m in range(s[0],s[1]+1):
    k = int(sqrt(m + 1))
    for i in range(2,k + 1):
        if m % i == 0:
            leap = 0
            break
    if leap == 1:
        print m
    leap = 1