#include<stdio.h>
bool islet(char x){
	if((x>='a'&&x<='z')||(x>='A'&&x<='Z')){
		return true;
	}
	return false;
}
int main(){
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	char ch,last;
	int l=0,c=0;
	last='!';
	while(scanf("%c",&ch)!=EOF){
		if(islet(ch)==true){
			++l;
			if(islet(last)==false){
				++c;
			}
		}
		last=ch;
	}
	printf("%d\n",(c/l));
	return 0;
}