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

int main(){
    
	ifstream f;
	ofstream g;
	int nrLetters, nrWords;
	string str;
	nrLetters = 0;
	nrWords = 0;
	f.open("text.in");
	g.open("text.out");
	getline(f, str);
	for (int i=0; i<str.size();i++)
	{
		if (isalpha(str[i])) nrLetters++;
		else if (isalpha(str[i-1])) nrWords++;
	} 
	if (isalpha(str[str.size()-1])) nrWords++;
	g << nrLetters/nrWords;
	return 0;
}