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

using namespace std;

bool esteLitera (char c)
{
    return (c>='A' && c<='Z') || (c>='a' && c<='z');
}


int main()
{   
    ifstream fin ("text.in");
    fin >> noskipws;
    
    int nrLit=0, nrCuv=0;
    while(!fin.eof())
    {
        char c;
        fin >> c;
        if (esteLitera(c))
        { 
            nrCuv++;
            while (esteLitera(c))
            {
                nrLit++;
                fin>>c;
            }
        }

    }

    ofstream fout ("text.out");
    fout << nrLit / nrCuv;
    return 0;
}