#include<fstream.h>


int main()
{char c;
 int nr1=0,nr2=0;
 
 ifstream f1("text.in");
 ofstream f2("text.out");
 
 while(!f1.eof())
 {c=f1.get();
  if(((c>='a')&&(c<='z'))||((c>='A')&&(c<='Z')))
  {nr1++;
   while(((c>='a')&&(c<='z'))||((c>='A')&&(c<='Z')))
	   nr2++,c=f1.get();
  }
 }
 f2<<nr2/nr1;
 
 f1.close();
 f2.close();
 return 0;
}