def nt(n):
  if n<2:
    ok=False
  else:
    ok=True
    for i in range(2,int(n**0.5)+1):
      if n%i==0:
        ok=False
        break
  return ok
a,b=map(int,input().split())
for l in range(a,b+1):
  if nt(l):
    print(l)
print()