#include <iostream>
#include <limits.h>
#include <cmath>
#include <string>
#include <stdio.h>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <stack>
#include <map>
#include <fstream>
#include <list>
#include <queue>
#include <iomanip>
#include <deque>
#include <set>

using namespace std;

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

string s;

int main()
{
    int cuvinte = 0;
    int litere = 0;
    bool ok = false;

    while(!f.eof())
    {
        f >> s;
        s[s.size()] = '-';

        for(int i = 0; i <= s.size(); i++)
            if (isalpha(s[i]))
                    litere++, ok = true;
            else
                if (ok)
                    {
                        cuvinte ++;
                        ok = false;
                    }
    }

    g << litere/cuvinte;

    return 0;
}