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string str;
ll num;
int leng ;
pll ans;

pll sol(int x){
  ll ry=0,rx=num;
  for(int i=0;i<x;i++){
    rx /= 10;
    ry *= 10;
    ry += 9;
  }
  for(int i=x;i<leng;i++) ry *= 10;
  rx = num - rx;
  ll gcd = __gcd(rx, ry);
  return MP(rx/gcd, ry/gcd);
}

int main(){
  while(cin >> str && str.length()>1){
    leng = num = 0;
    for(int i=2;i<str.length();i++){
      if(str[i] == '.') break;
      num *= 10;
      num += (str[i]-'0');
      leng ++;
    }
    
    ans = sol(1);
    for(int i=2;i<=leng;i++){
      pll x = sol(i);
      if(x.Y < ans.Y) ans = x;
    }
    cout << ans.X << '/' << ans.Y << endl;
  }
}