#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 line = " ";
  if (fin.is_open())
  {
    string tmp;
    while (fin)
    {
      getline(fin, tmp);
      line += tmp;
      line += " ";
    }
    fin.close();
  }

  int wordcount = 0;
  int lettercount = 0;
  bool newword = true;
  for (int ii = 0; ii < line.length(); ++ii)
  {
    if ((line[ii] >= 'a' && line[ii] <= 'z') || 
	(line[ii] >= 'A' && line[ii] <= 'Z'))
    {
      if (newword)
      {
	newword = false;
	++wordcount;
      }
      ++lettercount;
    }
    else
    {
      newword = true;
    }
  }
 

  ofstream fout;
  fout.open("text.out");
  int result = 0;
  if (wordcount > 0)
  {
    result = lettercount / wordcount;
  }
  fout << result << endl;
  fout.close();
  return 0;
}