#include <fstream>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int i,n,nrwords(0),word(0),letters(0);
int main()
{
 char aux;
 while(cin.get(aux))
    {
     if ((aux>='a' && aux<='z')||(aux>='A' && aux<='Z'))
         {
          word=1;
          ++letters;
          }
       else 
         if (word) ++nrwords,word=0;          
   }
 if (word) ++nrwords;
 cout<<letters/nrwords<<"\n";  
return 0;
}