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

ifstream f("text.in");
ofstream g("text.out");
int letters, words, lastLetter = '#';

bool isLetter(char x) {
    return ('a' <= x && x <= 'z') || ('A' <= x && x <= 'Z');
}

int main()
{
    while(!f.eof()) {
        char x = f.get();

        if (isLetter(x) && !isLetter(lastLetter)) words++;
        if (isLetter(x)) letters++;
        lastLetter = x;
    }
    g<<letters/words<<"\n";
    return 0;
}