#include <algorithm>
#include <cmath>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <string>
#include <sstream>
#include <stack>
#include <utility>
#include <vector>

using namespace std;

int main(int argc, char* argv[])
{
  ifstream fin("text.in");
  string text;
  if (fin.is_open())
  {
    getline(fin, text);

    fin.close();
  }

  int crtLen = 0;
  int total = 0;
  int nWords = 0;
  int ii = 0;

  while (ii < text.length())
  {
    while (ii < text.length() && ((text[ii] >= 'A' && text[ii] <= 'Z') ||
				  (text[ii] >= 'a' && text[ii] <= 'z')))
    {
      ++ii; 
      ++crtLen;
      ++total;
    }
    ++nWords;
    while ((ii < text.length()) && !((text[ii] >= 'A' && text[ii] <= 'Z') ||
	     (text[ii] >= 'a' && text[ii] <= 'z')))
    {
      ++ii;
    }
  }

  ofstream fout;
  fout.open("text.out");
  fout << (total / nWords) << endl;
  fout.close();
  return 0;
}