def nwd(a, b)
	if b==0 
		return a
	end
 
   	return nwd(b, a%b)
end
 
while true
	begin
		x = gets.split
	rescue 
		break
	end
	u1 = x[0].split('/')
	o = x[1].split('/')
	u2 = x[2].split('/')
 
	l= u1.split('/')
	m= u1.split('/')
 
	l1 = l[0].to_i
	l2 = l[1].to_i
	m1 = m[0].to_i
	m2 = m[1].to_i
	m3 = m1*m2
	if o == '+'
		l3 = l1*m2 + l2*m1
	elsif o == '-'
		l3 = l1*m2 - l2*m1
	elsif o == '*'
		l3 = l1*l2
	else: 
		l3 = l1*m2
		m3 = l2*m1	
	end
	dzielnik = nwd(l3, m3)
	jeden = l3/dzielnik
	jeden = jeden.to_s
	dwa = m3/dzielnik
	dwa = dwa.to_s
	puts jeden + '/' + dwa
end
 

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