#include"fstream.h"
#include"string.h"
int main()
{
 char l[2];
 int lit=0,cuv=0;
 ifstream in("text.in");
 ofstream out("text.out");
 while(!in.eof)
 {
  in>>l;
  if((l>="a" && l<="z") || (l>="A" && l<="Z"))
  {
   lit++;
  }
  else
   if(lit)
   {
    cuv++;
    lit=0;
   }
   else
    lit=0;
 }
 out<<(lit/med);
 out<<endl;
 in.close();
 out.close();
 return 0;
}