#include <iostream>
#include <sstream>

int main( ) {
   std::istringstream ent("1 23");
   int a, b;
   ent >> a >> b;
   std::cout << "leimos: " << a << " " << b << "\n";

   std::ostringstream sal;
   sal << 1 << "@" << 2;
   std::string s = sal.str( );
   std::cout << "escribimos: " << s << "\n";
}