#include <string.h>
#include <cstdio>
char s[1000];
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')))
{
k=k+1;
ok=0;
}
else if (ok==0) nr=nr+1;
nr=nr-1;
if (nr!=0)
printf("%d",k/nr);
else printf("0");
return 0;
}