#include<bits/stdc++.h>
using namespace std;
int huiwen(int s)
{
	int sum=1;
	while(s>0)
	{
		sum+=s%10;
		s/=10;
		sum*=10;
	}
	if(s==sum)
	return 1;
	else return 2;
}
bool prime(int a)
{
	for(int i=2;i*i<=a;i++)
	{
		if(a%i==0)
		return 1;
	}
	return 0;
}
int main()
{
    int a,b;
    cin>>a>>b;
    for(int i=a;i<=b;i++)
    {
    	if(i%2==0)
    	{
   		continue;
		}
		if(i%3==0)
		{
			continue;
		}
		if(i%5==0&&i!=5)
		{
			continue;
		}
		if(i%7==0&&i!=7)
		{
			continue;
		}
		if(huiwen(i)==1&&prime(i)==0)
		cout<<i<<endl;
	}
}