#include <iostream>

using namespace std;

class Fraction
{
	int nume, deno;
public:
	Fraction()
	{	nume = 0; deno = 1;	}
	Fraction(int n, int d)
	{	nume = n; deno = d;	}
	void Set(int n, int d)
        {       nume = n; deno = d;     }
	void Print() const
	{	cout << nume << "/" << deno;	}
	Fraction mult(Fraction f)
	{	Fraction t;
		int n, d;
		n = nume*f.nume;
		d = deno*f.deno;
		t.Set(n, d);
		return t;
	}
};
int main()
{
	int n, d;
	char dummy;
	Fraction x;
	Fraction y;	

	cout << "Input x (n/d, -1/1 to quit): ";
	cin >> n >> dummy >> d;
	while( n!=-1 && d!=1)
	{
		// Set x = n/d
		x.Set(n, d);
		cout << "Input y (n/d): ";
        	cin >> n >> dummy >> d;
        	// Set y = n/d
        	y.Set(n, d);

		// DEbug - out
		cout << "x: ";
		x.Print();
		cout << "\n\n";
		cout << "y: ";
        	y.Print();
        	cout << "\n";
		cout << Input x (n/d, -1/1 to quit): ";
  	        cin >> n >> dummy >> d;

	}

	cout << "Done.\n\n";
	return 0;
}