#include <fstream>
#include <iostream>
#include <string.h>
using namespace std;
ifstream in ("text.in");
ofstream out ("text.out");
char text;
bool cuvant=false;
int lungime,nr_cuvinte;
int main()
{
    while (!in.eof())
    {
        in>>noskipws>>text;
      if ((text>='a'&&text<='z')||(text>='A'&&text<='Z'))
      {
          lungime++;
            if (cuvant==false)
            {
                nr_cuvinte++;
                cuvant=true;

            }
      }
      else cuvant = false;

    }
    out<<lungime/nr_cuvinte;
    return 0;
}