#include <fstream>
#include <stdio.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{
  char caracter_curent = '\0';
  int lungime_totala = 0, nr_cuvinte = 0;

  while (caracter_curent != EOF)
  {
	f >> caracter_curent;

    if ((caracter_curent >= 'a' && caracter_curent <= 'z') || (caracter_curent >= 'A' && caracter_curent <= 'Z'))	
	  ++lungime_totala;
    else 
	{
      if (lungime_totala != 0) 		
	  ++nr_cuvinte;	
    } 
  } 	   
  
  g << lungime_totala / nr_cuvinte;
  
  return 0;
}