#include <string>
#include <iostream>

template<typename T> class triad
{ protected:
    T a, b, c;

  public:
    triad(T s1, T s2, T s3);
    T operator[](int i);
    void print();
};

template<typename T> ostream & operator<<(ostream & o, triad<T> & t)
{ o << "triad(" << t[0] << "," << t[1] << "," << t[2] << ")";
  return o; }

void main()
{
  triad<string> x("ant", "bat", "cat");
  triad<int> y(11, 222, 3333);
  cout << x[1] << " " << y[0] << "\n";
  cout << "x = " << x << "\n";
  cout << "y = " << y << "\n";
}

template<typename T> triad<T>::triad(T s1, T s2, T s3)
{ a = s1;
  b = s2;
  c = s3; }

template<typename T> T triad<T>::operator[](int i)
{ if (i == 0)
    return a;
  else if (i == 1)
    return b;
  else if (i == 2)
    return c;
  else
    cerr << "Error!\n"; }

template<typename T> void triad<T>::print()
{ cout << "triad(" << a << "," <<
          b << "," << c << ")"; }