#include<stdio.h>int gcd(int a,int b){ if(b==0) return a; return gcd(b,a%b);} int lcm(int a,int b){ int c=gcd(a,b); return a*b/c;} int main(){ int a,b,c,d; char ch; while(scanf("%d/%d%c%d/%d",&a,&b,&ch,&c,&d)!=EOF) { int m=lcm(b,d); int n; if(ch=='+') n=a*(m/b)+c*(m/d); else n=a*(m/b)-c*(m/d); if(n==0) printf("0n"); else { int t=gcd(m,n); n=n/t;m=m/t; if(m<0) m=-m,n=-n; if(m==1) printf("%dn",n); else printf("%d/%dn",n,m); } } return 0;}
