#include <fstream>

using namespace std;

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

bool is_letter(char c)
{
    if (c >= 'A' && c <= 'Z')
        return 1;
    if (c >= 'a' && c <= 'z')
        return 1;
    return 0;
}

char c, nr_words, nr_letters;

int main()
{
    while (cin.get(c))
    {
        while (is_letter(c))
        {
            nr_letters++;
            cin.get(c);
        }
        if (nr_letters)
            nr_words++;
    }
    cout << nr_letters / nr_words << '\n';
    return 0;
}