//     ===========================
//        Welcome to Pocket C++
//     ===========================
//
//     You can compile C++ files using F9 key (try it!).
//     Then you can execute the generated program pressing Ctrl+F9.
//
//     You can use F10 to switch to the related .h header file.
//
//     Good luck!

#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>
#include <string>
#include <sstream>
#include <stdint.h>
#include <locale>
#include <istream>
#include <ios>
#include <boost/lexical_cast.hpp>

using namespace std;

// Strongly-typed enums
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf
enum class Color : int { Red, Yellow, Blue };

string NumberToString (unsigned long number )
{
 ostringstream ss;
 ss << number;
 return ss.str();
}

bool prime(unsigned long x){

	if ((fmod(x,2) == 0 and x != 2) or x == 1) return false;

	for (unsigned long i = 3;i <= sqrt(x);i=i+2){
		if (fmod(x,i) == 0) return false;
	}

	return true;
}

bool truncate(unsigned long x){

	//string str = NumberToString(x);
	string str = boost::lexical_cast<string>(x);

	for (unsigned long i = 0; i<str.length();i++){
		if (not prime(boost::lexical_cast<unsigned long>(str.substr(i,str.length()-i))))
			return false;
	}

	for (unsigned long i = 0; i<str.length();i++){
		if (not prime(boost::lexical_cast<unsigned long>(str.substr(0,str.length()-i))))
			return false;
	}

	return true;
}

int main(){

	int i = 1;
	unsigned int x = 11;

	while (i<=11){

		if (truncate(x)){
			cout << x << "-" << i << "\n";
			i++;
		}

		x=x+2;
	}
}