#include <cstdio>
#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

int main()
{
	string aux;
	long int nrCuvinte = 0,totalLungimi = 0;
	
	ifstream in; in.open("text.in");
	while (in.good())
	{
		in >> aux;
		nrCuvinte += 1;
		totalLungimi += aux.size();
	}
	
	ofstream out; out.open("text.out");
	out << (long int) totalLungimi/nrCuvinte;
	out.close();
	
	return 0;
}