# include <stdio.h>   
# include <string.h>   
long int k,l,ok,i,q;   
char a[50000],x;   
int main ()   
{
freopen ("text.in","r",stdin);   
freopen ("text.out","w",stdout);   

fread (a,1000,1,stdin);

q=0;
for (i=0;i<strlen(a);i++)
if ((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z'))
{
k++;
ok=1;
q=1;
}
else
if (ok==1)
{
l++;
ok=0;
}
if (q==1)
l++;




printf ("%li",k/l);
return 0;
}