#include<stdio.h>

int main()
 {
  freopen("text.in","r",stdin);
  freopen("text.out","w",stdout);
  char c;
  long s=0,sz=0,k,ok=0;

  while (scanf("%c",&c)!=EOF)
   {
    if ((c>='a' && c<='z') || (c>='A' && c<='Z'))
      {
       s++;
       ok=1;
      }
    else
      if (ok)
	{ sz++; ok=0; }
   }
  if (sz)
  { k=s/sz;
    printf("%ld",k);
  }
  else printf("0");
  return 0;
 }