#include <fstream>

using namespace std;

int main(){
	char c_act, c_urm;
	int lung_tot = 0, nr_cuv = 0;
	ifstream citire ("text.in");
	citire.get(c_act);
	while (!citire.eof()){
		citire.get(c_urm);
		if (c_act >= 'a' && c_act <= 'z' || c_act >= 'A' && c_act <= 'Z'){
			lung_tot++;
			if ((c_urm < 'a' || c_urm > 'z') && (c_urm < 'A' || c_urm > 'Z'))
				nr_cuv++;
		}
		c_act = c_urm;
	}
	citire.close();
	ofstream afisare ("text.out");
	afisare << lung_tot / nr_cuv;
	afisare.close();
	return 0;
}