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

using namespace std;

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");

    unsigned int cuvinte = 0;
    unsigned int lungime = 0;
    string curent;

    while (true){
        in >> curent;
        cuvinte++;
        if ( in.eof() ) break;
        lungime += curent.length();
    }

    out << floor(lungime/cuvinte);

    return 0;
}