#include<bits/stdc++.h>
using namespace std;
int a[]={11,13,17,31,37,71,73,79,97};
int main()
{
	int n,m;
	cin>>n>>m;
	for(int i=0;i<11;i++)
	{
		if(n<=a[i] && m>=a[i]) cout<<a[i]<<endl;
	}
	return 0;
}