#include<fstream.h>
#include<string.h>

int main()
{
 ifstream fin("text.in");
 ofstream fout("text.out");
 char c;
 int lit=0,cuv=0,flag=0;
  while(fin.get(c))
  {
   if(strchr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",c)!=NULL)
   {
   lit++;
   if(!flag)
     {
     cuv++;
     flag=1;
     }
   }
   else
    flag=0;
  }
 fout<<lit/cuv;
 fin.close();
 fout.close();
return 0;
}