#include <stdio.h>

char c,uc;
int k,a;

int main ()
{
  freopen("text.in","r",stdin);
  freopen("text.out","w",stdout);
  scanf("%c",&uc);
  if (uc>='a'&&uc<='z' || uc>='A'&&uc<='Z') k=1;
     else k=0;
  do {
       uc=c;
       scanf("%c",&c);
       if (uc>='a'&&uc<='z' || uc>='A'&& uc<='Z') {
					       k++;
					       if (!(c>='a'&&c<='z' || c>='A'&&c<='Z')) a++;
                                                   }
      }while (!feof(stdin));
  if (uc>='a'&&uc<='z' || uc>='A'&&uc<='Z') a++;
  printf("%d", k/a);
  return 0;
}