#include <iostream>
#include <fstream>
using namespace std;
int  nrl,nrlc=0 ,nrcuv=0,s;
//0 corespunde unui separator
//1 e litera
char c;
int main()
{ifstream f("text.in");
ofstream g("text.out");

while (!f.eof())
  { f.get(c);

    if(c>='a' && c<='z' || c>='A'&& c<='Z')
     nrlc++;


  else {s=s+nrlc;
  if(nrlc!=0) nrcuv++;

  nrlc=0;
}}
g<<s/nrcuv;

    return 0;
}