#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;

int nrLitere, nrCuv;

char c;

ifstream fin("text.in");
ofstream fout("text.out");

int main()
{
    while (fin.get(c)) {
        if (isalpha(c)) {
            nrCuv++;
            while (isalpha(c)) {
                nrLitere++;
                fin.get(c);
            }
        }
    }
    fout << nrLitere / nrCuv;

    return 0;
}