#include <iostream>

template <typename t> class Number;

template <typename t>
std::ostream & operator<<(std::ostream & os, const Number<t>& a);

template <typename t>
Number<t> operator%(Number<t> a, Number<t> b);

template <typename t>
class Number
{
private:
    t n;
public:
    Number(t a) :n{ a } {};
    Number() :n{ t() } {};
    friend std::ostream & operator<< <t>(std::ostream & os, const Number& a);
    friend Number operator%<t>(Number a, Number b);
};

template <typename t>
std::ostream & operator<<(std::ostream & os, const Number<t>& a)
{
    os << a.n;
    return os;
}

template <typename t> 
Number<t> operator%(Number<t> a, Number<t> b)
{
    return Number<t>(a.n % b.n);
}

int main()
{
   Number<int> a(10);
   Number<int> b(20);
   Number<int> c = a % b;
   std::cout << c << std::endl;
}