#include <stdio.h>
#include <string.h>

int main()
{
 int n,i=-1,l=0,c=1;
 char sir[1024];
 freopen("text.in","r",stdin);
 freopen("text.out","w",stdout);
 gets(sir);
 n=strlen(sir);
 do
 {
  ++i;
  if (((sir[i]<123)&&(sir[i]>96))||((sir[i]<91)&&(sir[i]>64))) ++l;
  else if (((sir[i+1]<123)&&(sir[i+1]>96))||((sir[i+1]<91)&&(sir[i+1]>64))) ++c;

 }
 while (i<n-1);
 printf("%d",l/c);
 return 0;
}