#include <iostream>
#include <stdlib.h>

using namespace std;


long nzd_poz(long p, long q)
{
	if (q==1)
		return 1;
		
	if (q==0)
		return p;
		
	return (q, p%q);
}

long nzd(long p, long q)
{
	p = abs(p);
	
	q = abs(q);
	
	if (p>=q)
		return nzd_poz(p,q);
		
	return nzd_poz(q,p);
}

void skrati(long &p, long &q)
{
	if (q<0)
	{
		p = -p;
		
		q = -q;
	}
	
	long d = nzd(p,q);
	
	p /= d;
	
	q /= d;
}

void ispisi(long p, long q)
{
	skrati(p,q);
	
	cout << p<< '/' << q;
}

int main()
{
	long p,q,r,s,a,b;
	
	cin >> p >> q;
	
	if (q==0)
	{
		cout << "Imenilac ne sme biti 0\n";
		
		return 0;
	}

	skrati(p,q);
	
	cin >> r >> s;
	
	if (s==0)
	{
		cout << "Imenilac ne sme biti 0\n";
		
		return 0;
	}
	
	skrati(r,s);
	
	a = p*s + q*r;

	b = q*s;
	
	ispisi(p,q);

	cout << " + ";

	ispisi(r,s);
	
	cout << " = ";
	
	ispisi(a,b);
	
	cout << endl;
	
	system("PAUSE");
	
	return 0;
}