#include <fstream>

using namespace std;

fstream f;
fstream g;
char c;
int words;
int letters;
int flag;

int main()
{
    f.open("text.in",fstream::in);
    flag=0;
    g.open("text.out",fstream::out);
    f >> noskipws;
    while(!f.eof())
    {
       f >> c;
       if(c>64&&c<91||c>96&&c<123)
          {
             letters++;
             if(!flag)
                {
                            words++;
                            flag=1;
                }                     
          }            
       else
         flag=0;   
    }
    g << (letters/words) << "\n";
    g.close();
    return 0;
}