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

#define endl '\n'

ifstream f("text.in");
ofstream g("text.out");

char c;
long long nrlit, nrcuv, init;

int main()
{
    while(f.get(c))
    {

        if((c >= 'a' && c <= 'z') || ( c >= 'A' && c <= 'Z'))
            ++nrlit,
            init = 1;
        else if(init)
            ++nrcuv,
            init = 0;
    }

    g << nrlit / nrcuv;
}