#include <stdio.h>

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