#include <iostream>
#include <algorithm>
using namespace std;

int main(){
   int ans = 0,plus = 0;
   string s,pm = "";
   cin >> s;
   for(int i = 0;i < s.size();i++) if(!isdigit(s[i])) pm += s[i];
   plus = count(pm.begin(),pm.end(),'+');
   stable_sort(s.begin(),s.end());
   reverse(s.begin(),s.end());
   for(int i = 0;i < s.size() - 2 * pm.size();i++){
      ans *= 10;
      ans += s[i] - '0';
   }
   for(int i = s.size() - 2 * pm.size();i < s.size() - pm.size();i++){
      if(plus){
         ans += s[i] - '0';
         plus--;
      }else ans -= s[i] - '0';
   }
   cout << ans << endl;
}