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#include <iostream>
#include <string>
using namespace std;
int main() {
    string s;
    cin >> s;
    int cnt=0;
    for (int i = 0; i<=s.size()-5; i++) {
        if (s[i]=='>' and s[i+1]=='>' and s[i+2]=='-' and
        s[i+3]=='-' and s[i+4]=='>' or s[i]=='<' and s[i+1]=='-'
        and s[i+2]=='-' and s[i+3]=='<' and s[i+4]=='<') cnt++;
    } cout << cnt;
    return 0;
}