#include <stdio.h>   
#include <string.h>   
  
int main()   
{   
 long n,i=-1,l=0,c=1;   
 char sir[1000000];   
 freopen("text.in","r",stdin);   
 freopen("text.out","w",stdout);   
 gets(sir);   
 n=strlen(sir);   
 do   
 {   
  ++i;   
  if ((((int)sir[i]<123)&&((int)sir[i]>96))||(((int)sir[i]<91)&&((int)sir[i]>64))) ++l;
  else if ((((int)sir[i+1]<123)&&((int)sir[i+1]>96))||(((int)sir[i+1]<91)&&((int)sir[i+1]>64))) ++c;
  
 }   
 while (i<n-1);   
 printf("%d",l/c);   
 return 0;   
}