#include <iostream>
#include <cstring>
#include <fstream>
  
using namespace std;
  
ifstream f("text.in");
ofstream g("text.out");
  
char c;
int numar_cuvinte, numar_caractere, cuvant, caracter;
  
int main()
{
    cuvant = 1;
    while(f.get(c))
    {
        if(c>='a' && c<='z' || c>='A' && c<='Z')
        {
            if(cuvant == 1)numar_cuvinte++;
            cuvant = 0;
            numar_caractere++;
            caracter = 1;
        }
        else if(c!='-') cuvant = 1;
        if(caracter == 0 && strchr(",-?!;':", c))
        {
            numar_cuvinte++;
            caracter = 0;
        }
    }
  
    g<<numar_caractere/numar_cuvinte;
    return 0;
}