#include <iostream>
#include <iterator>
#include <fstream>
#include <string>
#include <functional>
#include <numeric>
#include <algorithm>

class TextTokenizer
{
private:
    const char* inFileName_;
    const char* outFileName_;
    unsigned long noWords_;
    unsigned long noChars_;
public:
    TextTokenizer(const char* inFileName, const char* outFileName)
    : outFileName_(outFileName), inFileName_(inFileName), noWords_(0), noChars_(0)
    {
    }

    unsigned long wordsAvg()
    {
        std::ifstream in;
        std::ofstream out;
        std::string crt_line;
        std::string prev_line = "";
        unsigned long wc;
        int a = 0;
        in.open(inFileName_);
        out.open(outFileName_);

        while (!in.eof()) {
            std::getline(in, crt_line);
            wc = 0;
            if (crt_line != prev_line) {
                prev_line = crt_line;
                if (crt_line.empty()) {
                    wc = 0;
                } else {
                    wc = std::isalpha(*crt_line.begin()) ? 1 : 0;
                    for (std::string::const_iterator pen = crt_line.begin();
                        ++ pen != crt_line.end();) {
                        noChars_ += std::isalpha(pen[0]) ? 1 : 0;
                        wc += (std::isalpha(pen[0]) ? 1 : 0) &&
                              (std::isalpha(pen[-1]) ? 0 : 1);
                    }
                }
            }
            noWords_ += wc;
        }
        out << noChars_ / noWords_;
        in.close();
        out.close();
    }
};

int main(int argc, char** argv)
{
    TextTokenizer tk("text.in", "text.out");
    tk.wordsAvg();
    return 0;
}