# include <fstream>
# include <string>
# include <cstring>

using namespace std;

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

const int tMB = 2048;
const char d[] = " -,.?!'_=;:";

char s[tMB], *p;
int w, l;

int main() {
    fin.getline(s, tMB);

    p = strtok(s, d);
    while (p) {
        ++w;
        l += strlen(p);
        p = strtok(NULL, d);
    }

    fout << (l/w);
    return 0;
}