#include<stdio.h>
#define fin "text.in"
#define fout "text.out"
char ch;
long cuv,lit;
int sw;
int main(void)
{
 freopen(fin,"r",stdin);
 freopen(fout,"w",stdout);
 ch= getchar();

 while(ch !=EOF)
  {
   sw=0;
   while((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))
    {
     lit++;
     sw++;

     ch = getchar();
    }

   if(sw)
    cuv++;

   ch= getchar();

  }

  printf("%ld",lit/cuv);

  return 0;
  fcloseall();


}