#include <iostream>
#include <fstream>
#include <string>

using namespace std;

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

string s;
int main()
{
    getline(fin, s);
    int n = s.size(), i, word_count = 0, letter_count = 0;

    for (i = 0; i < n; i++)
    {
        if (isalpha(s[i]))
        {
            word_count++;

            while (isalpha(s[i]))
                letter_count++, i++;
        }
    }

    fout << letter_count / word_count;

    return 0;
}