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

int main()
{
    ifstream f("text.in");
    char c;
    int countWords=0;
    int countLocalLetters=0;
    int countGlobalLetters=0;

    f >> noskipws;

    while(f>>c)
        if(isalpha(c))
        {
            if(countLocalLetters!=0)
                countLocalLetters++;
            else
            {
                countWords++;
                countLocalLetters=1;
            }
            countGlobalLetters++;
        }
        else
            countLocalLetters=0;

        f.close();

        ofstream g("text.out");
        g<<countGlobalLetters/countWords;
        g.close();

    return 0;
}