#include <fstream>
#include <string>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main() {
	char s;
	int cuv = 0, nr = 0;
	bool cuvAc = false;
	while(f.get(s)){
		if (('a' <= s && s <= 'z') || ('A' <= s && s <= 'Z')) {
			nr++;
			cuvAc = true;
		}
		else if (cuvAc) {
			cuv++;
			cuvAc = false;
		}
	}
	g << nr / cuv;
	return 0;
}