#include <fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

int main()
{int cnt = 0,suma=0;

    string s;
    while (fin >> s)
    {
        suma = suma + s.length();
        for(int i = 0;i < s.length();i ++)
            if(s[i] == '-')
            cnt ++;
        cnt ++;
    }
        fout<< suma / cnt;
    return 0;
}