#include<iostream>
#include<fstream>
using namespace std;

bool eLitera(char c){
	if ((c >= 'a'&&c <= 'z') || (c >= 'A'&& c <= 'Z')){
		return true;
	}
	return false;
}

int main(){
	ifstream f("text.in");
	char c = NULL;
	int cuvinte=0;
	int litere = 0;
	int s = 0;
	while (f.get(c)){
		if (eLitera(c)){
			litere++;
		}
		else{
			if (litere) cuvinte++;
				s += litere;
				litere = 0;
		}
	}
	ofstream o("text.out");
	o << s / cuvinte;
	return 0;
}