求解求解11111111

l=[i.split('/') for i in input().split()]
a1,b1,a2,b2 = map(int,[l[0][0],l[0][1],l[1][0],l[1][1]])

fz=a1*b2+a2*b1
fm=b1*b2
x,y=fm,fz
r=x%y
while r!=0:
    x=y 
    y=r
    r=x%y
print(fz//y,fm//y,sep='/')