#include <fstream>

using namespace std;

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

char c;
int numberOfWords, numberOfCharacters;
bool found = false;

inline bool isCharacter(char c) {
    return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
}

int main() {
    while (in.get(c)) {
        if (isCharacter(c)) {
            if (!found) {
                found = true;
                ++numberOfWords;
            }
            ++numberOfCharacters;
        } else
            found = false;
    }
    out << numberOfCharacters / numberOfWords << "\n";
}