def prime(i):
    j=0
    jug=0
    for j in range(2,i-1):
        if i%j==0:
            jug=1
            break
    if jug==0:
        return True
    else:
        return False
    
a, b=map(int,input().split())
k=0
j=0
for k in range(a,b+1):
    if prime(k)!=False:
        print(k)