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

int main()
{
    int nrlitere=0 , nrcuvinte=0;
    char x;
    ifstream f("date.in");
    ofstream g("date.out");
    while(f.get(x))
    {
        while((!((x>='a'&&x<='z')||(x>='A'&&x<='Z')))&&!f.eof())
            f.get(x);
        if((x>='a'&&x<='z')||(x>='A'&&x<='Z'))
            nrcuvinte++;
        while(((x>='a'&&x<='z')||(x>='A'&&x<='Z'))&&!f.eof())
        {
            nrlitere++;
            f.get(x);
        }
    }

    g<<nrlitere/nrcuvinte;
    return 0;
}