n=list(map(int,input().split()))
a,b=n[0],n[1]+1
def judge(x):
        k=2
        flag=True
        while k<=x//2 and flag:
            if x%k==0:
                flag=False
            k=k+1
        return flag
for i in range(a,b):
        #print(i)
        if judge(i):
                print(i)