#include <iosfwd>

struct Fraction
{
  int numerator;
  int denominator;
};

std::ostream& operator<<(std::ostream&, const Fraction&);



#include <iostream>

std::ostream& operator<<(std::ostream& os, const Fraction & f)
{
	return os << f.numerator << " / " << f.denominator ;
}



int main()
{
	std::cout << Fraction{ 5, 9} << '\n' ;
}