#include<stdio.h>
#include<string.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;
  }