#include <stdio.h>


long long l,nr;
char c,re;

int main()
{
freopen("text.in","rt",stdin);
freopen("text.out","wt",stdout);
while (!feof(stdin))
   {
   re=c;
   c=getchar();
   if ((c<='Z'&&c>='A')||(c<='z'&&c>='a')) l++;

   if ( (!((c<='Z'&&c>='A')||(c<='z'&&c>='a')))&&(((re<='Z'&&re>='A')||(re<='z'&&re>='a')))) nr++;
   }

printf("%lld",l/nr);

fclose(stdin);
fclose(stdout);

return 0;
}