#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)

using namespace std;

typedef long long int lli;

int main() {
    string s;
    cin >> s;
    int cnt = 0;
    REP (i, 0, s.size()) cnt += (s[i] == '-');
    cout << (s.size() - cnt) / 3 << endl;
    return 0;
}