#include <fstream>
#include <iostream>
#include <string>
#include <string.h>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

int lungime, nr;

void calc(char linie[255]){
  char separatori[27]=",./;'\\-<>?! ()[]";
  char * pch;
  pch = strtok (linie, separatori);
  while (pch != NULL)
  {
    lungime += strlen(pch);
    nr++;
    pch = strtok (NULL, separatori);
  }
}

int main(){
  char line[255];
  
  while (!fin.eof()) {
    fin.getline(line, 255);
    calc(line);
  }
   fout<<lungime/nr;
}