#include <stdio.h>

int main ()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	int cuv,lit,lpc,ras;
	char c;
	
	cuv=0;
	lit=0;
	lpc=0;
	
	while(scanf("%c",&c)!=EOF){
		if('A'<=c&&c<='Z'||'a'<=c&&c<='z'){
			lit=lit+1;
			lpc=lpc+1;
			} else {
				if (lpc > 0) {
					lpc=0;
					cuv=cuv+1;
				}
			}
		}
	
	ras=lit/cuv;
	
	printf("%d",ras);
	
	return 0;
}