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

int main ()
{
    ifstream in("text.in");
    ofstream out("text.out");
    char c;
    int litere=0,cuvinte=0,contor=0;

    while(!in.eof())

    {
        in.get(c);
        contor=0;
        while(('z'>=c&&c>='a')||('Z'>=c&&c>='A'))
        {
            contor=1;
            litere++;
            in.get(c);
        }
        if(contor==1)
            cuvinte++;
        }
        out<<litere/cuvinte;

        }