#include <stdio.h>
int ch[1000001],nr_lit,nr_cuv,k;
int main ()
{
	freopen ("text.in","r",stdin),freopen ("text.out","w",stdout);
	int i;
    while (scanf("%c",&ch[++k]) != EOF)
          if ((65<=ch[k] && ch[k]<=90) || (97<=ch[k] && ch[k]<=122))
             ++nr_lit;
    for (i=1; i<k; ++i)
        if ((65<=ch[i] && ch[i]<=90) || (97<=ch[i] && ch[i]<=122))
        {
           nr_cuv++;
		   while ((65<=ch[i] && ch[i]<=90) || (97<=ch[i] && ch[i]<=122))
                 ++i;
        }
	printf ("%d",nr_lit/nr_cuv);
    return 0;
}