#include <iostream.h>
#include <string.h>
int main()
{
    char s[100];
    while(cin>>s)
    {
        int a=0,b=0,i;
        int pos=0;
        while(s[pos]!='/')
        pos++;
        for(i=0;i<pos;i++)
        a=a*10+s[i]-'0';
        for(i=pos+1;i<strlen(s);i++)
        b=b*10+s[i]-'0';
        if(a==0)
        cout<<"0"<<endl;
        else if(b==0)
        cout<<"error"<<endl;
        else
        {  
        int flag=a/b;
        if(flag!=0) cout<<flag;
        a=a%b;
        if(a!=0)
        {
            for(i=2;i<=b;i++)
            while(a%i==0 && b%i==0)
            {
            b=b/i;
            a=a/i;
            }    
            if(flag!=0)
            cout<<"-";
            cout<<a<<"/"<<b<<endl;
        }
        else
        cout<<endl;
        }    
        }
}        

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