#include <cstdio>
#include <string.h>
char s[10000];
int n,nr,i,ok,k,h;
int main ()
{
freopen ("text.in","r",stdin);
freopen ("text.out","w",stdout);
gets (s);
h=strlen(s);
ok=1;
for (i=1;i<=h;i++)
if ((('A'<=s[i])&&(s[i]<='Z'))||(('a'<=s[i])&&(s[i]<='z'))||(('0'<=s[i])&&(s[i]<'9')))
{
k=k+1;
if (ok==1)
{
	nr=nr+1;
	ok=0;
}
}
else ok=1;
if (nr!=0)
printf("%d",k/nr);
else printf("0");
return 0;
}