#include <cstring>
#include <fstream>

#define BMAX 1024
#define SMAX 1050000

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

int len;
char str[SMAX];

int sum;
int cuv;

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

int main() {
    while (fin.getline(str + 1 + len, BMAX))
        len += strlen(str + 1 + len);

    for (int i = 1; i <= len; i++)
        if (isLetter(str[i])) {
            sum++;
            if (!isLetter(str[i - 1]))
                cuv++;
        }

    fout << sum / cuv << '\n';
    fout.close();
    return 0;
}