#include <stdio.h>


long cuv=0,caract=0;
int k=0;
char a;

int main()
{

freopen("text.in","r",stdin);
freopen("text.out","w",stdout);

while (scanf("%c",&a)!=EOF)
{
  if (((a>=65)&&(a<=90))||((a>=97)&&(a<=122))) {
				caract++;
				k=1;
				}
  else if (k==1) {cuv++; k=0;}

}
if (k==1) cuv++;
printf("%ld",caract/cuv);
return 0;
}