#include <bits/stdc++.h>

using namespace std;

ifstream f("text.in");

ofstream g("text.out");

char c, ant;

int ncuv, lg;

int main()

{

    while (!f.eof())

    {

        c = f.get();

        if (f.eof())
            break;

        if (isalpha(c))

            lg++;

        else if (isalpha(ant))

            ncuv++;

        ant = c;
    }

    if (isalpha(ant))

        ncuv++;

    g << lg / ncuv;

    return 0;
}