#include <fstream>
using namespace std;
int main()
{
 ifstream cin("text.in");
 ofstream cout("text.out");
 char ch;
 int cntcuv=0,nrlit=0,nrlit1=0;
 while(cin.get(ch))
 {
     if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
     {
         nrlit++;
         nrlit1++;
         if(nrlit1==1)
         {
             cntcuv++;
         }
     }
     else
     {
         nrlit1=0;
     }
 }
 cout<<nrlit/cntcuv<<'\n';
    return 0;
}