# include <stdio.h> 
# include <string.h> 
long int k,l,ok,i,q,y; 
char c; 
float z,x,p; 
int main () 
{ 
freopen ("text.in","r",stdin); 
freopen ("text.out","w",stdout); 
q=0; 
while (scanf ("%c",&c)!=EOF) 
if ((c>='a' && c<='z') || (c>='A' && c<='Z')) 
{ 
k++; 
ok=1; 
q=1; 
} 
else 
if (ok==1) 
{ 
l++; 
ok=0; 
} 
if (q==1) 
l++; 
printf ("%li",k/l); 
return 0; 
}