#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("0\n");
        else
        {
            int t=gcd(m,n);
            n=n/t;m=m/t;
            if(m<0)  m=-m,n=-n;
            if(m==1) printf("%d\n",n);
            else
            printf("%d/%d\n",n,m);
        }    
    }    
    return 0;
}