#include <fstream>
#include <cstring>
using namespace std;

ifstream in("text.in");
ofstream out("text.out");

int main(void)
{
    char sir[1048576], *p, delim[] = " ,.-!?";
    int long long numar_litere = 0, numar_cuvinte = 0;
    in.get(sir, 1048576);
    p = strtok(sir, delim);
    while (p)
    {
        numar_cuvinte++;
        numar_litere += strlen(p);
        p = strtok(NULL, delim);
    }

    out << (int) numar_litere / numar_cuvinte;
    return 0;

}