//      CS 212 Computer Programming II  Assignment 3
//      Due: Monday February 28, 2011
//
//      File: homework2.cpp
//      Author: Katie Buck
//      Instructor: Dr. Wang
//
//      Compile: g++ homework3.cpp
//      Run:    ./a.out < fractions.txt > out3.txt
//
//      Goal: The goal of this program is to define a Fraction class
//	 that contains the function members and be able to add,
//	 subtract, divide, and reduce fractions.

#include <iostream>
using namespace std;
        
class Fraction
{       int nume;
        int deno;

        Fraction reduce ()
        {
                int n = nume;
                int d = deno;
                while ( d != 0)
                {
                        int r = n%d;
                        n = d;
                        d = r;
                }

                if ( n != 0)
                {
                        nume /= n;
                        deno /= n;
                }
                if (deno < 0)
                {
                        nume *= (-1);
                        deno *= (-1);
                }
}



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 operator+(Fraction x)
        {       Fraction ans;
                ans.nume = nume * x.deno + deno * x.nume;
                ans.deno = deno * x.deno;
                // use the reduce()
                ans.reduce();
                return  ans;
        }
        Fraction operator-(Fraction x) 
        {       Fraction ans;
                ans.nume = nume * x.deno - deno * x.nume;
                ans.deno = deno * x.deno;
		ans.reduce();
                return  ans;
        }

	Fraction operator*(Fraction x)
        {       Fraction ans;
                ans.nume = nume * x.nume;
                ans.deno = deno * x.deno;
		ans.reduce();
                return  ans;
        }
        Fraction operator/(Fraction x)
        {       Fraction ans;
                ans.nume = nume * x.deno;
                ans.deno = deno * x.nume;
		ans.reduce();
                return  ans;
        }
         
};

int main()
{
	int a1, b1;
	int a2, b2;
	char dummy, op;

while(cin)
{
	cin >> a1 >> dummy >> b1;
	cin >> op;
	cin >> a2 >> dummy >> b2;

	Fraction f1, f2, answ;
	f1.Set(a1, b1);
	f2.Set(a2, b2);

	if(op == '+')	answ = f1 + f2;
	if(op == '-')	answ = f1 - f2;
	if(op == '*')	answ = f1 * f2;
	if(op == '/')	answ = f1 / f2;

	f1.Print();
	cout << " " << op << " ";
	f2.Print();
	cout << " = ";
	answ.Print();
	cout << "\n";
}

	return 0;
}