#include<stdio.h>
#define FIN "text.in"
#define FOUT "text.out"
long lit;
char c;
int nrcuv,sw;
int main(void)
{
 freopen(FIN,"r",stdin);
 freopen(FOUT,"w",stdout);
 scanf("%c",&c);

 while(c != NULL)
  {
   sw=0;
     while((c>='a' && c<='z') || (c>='A' && c<='Z'))
      {
       lit++;
       sw=1;
       scanf("%c",&c);
      }
     if(sw)
      nrcuv++;
     scanf("%c",&c);
  }

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


  fcloseall();
  return 0;

}