#include<iostream>
#include<cmath>
#include<cstdio>
#include<algorithm>
#include<vector>
using namespace std;
int a[100005];
bool ss(int i)
{
	int t=2;
	if(i<2) return 0;
	while(t<i)
	{
		if(i%t==0) return 0;
		t++;
	}
	return 1;
}
bool zss(int i)
{
	int t=0,s=2;
	if(ss(i))
	{
		while(i)
		{
			t=t*10+i%10;
			i/=10;
		}
		while(s<t)
		{
			if(t%s==0) return 0;
			s++;
		}
		return 1;
	}
}
int main()
{
	int m,n,t=0;
	cin>>m>>n;
	int l=0;
	for(int i=m;i<=n;i++)
	{
		if(zss(i)) 
		{
			cout<<i<<",";
		}
		
	}
	return 0;
	cout<<"No";
	
}