#include<iostream>
using namespace std;
int a1[1005] = {0,0,0,0,0,0,0,0,0,0,0,11,0,13,0,0,0,17,0,0,0,0,0,0,0,0,0,0,0,0,0,31,0,0,0,0,0,37,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,71,0,73,0,0,0,0,0,79,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,97,0,0,0};
int main(){
	int a,b;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(a1[i]!=0) cout<<i<<endl;
	}
	return 0;
}