//A327
#include <iostream>
#include <vector>
using namespace std;

int main() {
	cout<<"Primes: ";
	bool prime;
	int a,b;
	cin>>a>>b;
	vector<int> primes;
	for(int e=2; e<=b; e++)
	{
		prime=true;
		for(int i=0; i<primes.size(); i++)
		{
			if((e%primes[i])==0) prime=false;
		}
		if(prime==true)
		{
			primes.push_back(e);
			if(e>=a) cout<<e<<" ";
		}
	}
	if(b<2) cout<<"Not found.";
	return 0;
}