//
//	1/2 + 3/4 = ?

#include <iostream>
using namespace std;

class Fraction
{	int nume, deno;
	//reduce the fraction p115
	void reduce(fracType& x)
	{
		int n = x.nume;
		int d = x.deno;
	}	
		while( d != 0 )
		{
			int r = n % d;
			n = d;
			d = r;
		}
		if ( n != 0 )
		{
			x.nume /= n;
			x.deno = /= n;
		}
		if ( x.deno < 0)
		{
			x.nume *= (-1);
			x.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 Addition(Fraction x)
	{ 	Fraction ans; 	//temp obj
		ans.nume = nume * x.deno + deno * x.nume;
		ans.deno = deno * x.deno;	
		//use the reduce()
		//???
		return ans;	
	}
	Fraction Subtraction(Fraction x)
        {       Fraction ans;   //temp obj
                ans.nume = nume * x.deno - deno * x.nume;
                ans.deno = deno * x.deno;
                return ans;
        }
	 Fraction Multiplication(Fraction x)
        {       Fraction ans;   //temp obj
                ans.nume = (nume * x.nume);
                ans.deno = (deno * x.deno);
                return ans;
        }
	 Fraction Division(Fraction x)
        {       Fraction ans;   //temp obj
                ans.nume = (nume / x.nume);
                ans.deno = (deno / x.deno);
                return ans;
        }


};

int main()
{
	Fraction a, b, c, d, e, f; 	// c = a + b
	int t1, t2, t3,t4;

	cin >> t1 >> t2 >> t3 >> t4;
	a.Set(t1, t2);		// d = a - b ; e = a * b
	b.Set(t3, t4);		// f = a / b
	

	c = a.Addition(b);
	a.Print();
	cout << " + ";
	b.Print();
	cout << " = ";
	c.Print();
		cout << "\n\n";

	d = a.Subtraction(b);
	a.Print();
        cout << " - ";
        b.Print();
        cout << " = ";
	d.Print();
	//cout << " - ";
		cout << "\n\n";

	e = a.Multiplication(b);
	a.Print();
        cout << " * ";
        b.Print();
        cout << " = ";
	e.Print();
		cout << "\n\n";

	f = a.Division(b);
        a.Print();
        cout << " / ";
        b.Print();
        cout << " = ";
        f.Print();
                cout << "\n\n";	

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