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