#include <iostream>
using namespace std;
bool isPrim(int n){
if(n == 0)
return false;
for (int i = 2; i< n; i++){
if ( ( (n % i) == 0) && (i != n) && (i != 1) )
return false;
};
return true;
};
int main(){
int start, end, prim[3];
prim[0] = 0;
prim[1] = 0;
prim[2] = 0;
cout << "START: ";
cin >> start;
cout << "END: ";
cin >> end;
cout << endl;
for (int i = start; i <= end; i++){
if (isPrim(i) == true){
if(prim[0] == 0){
prim[0] = i;}
else prim[1] = i;
if ( (prim[0] != 0) && (prim[1] != 0) ){
if( (prim[1] - prim[0]) == 2){
cout << prim[0] << " - " << prim[1] << "\n";
prim[2]++;
cout << "NR:" <<prim[2] <<"\n";
};
prim[0] = prim[1];
prim[1] = 0;
};
};
};
return 0;
};