#include <bits/stdc++.h>
using namespace std;
int main() {
  string S;
  cin >> S;
  int answer = 0;
  for (int i = 0; i < S.size(); i++) {
    if (S.at(i) == '+') {
      answer++;
    }
  }
  cout << answer - S.size() + answer << endl;
}
