#include <bits/stdc++.h>

using namespace std;

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

int main()
{
    char ch;
    int cuvant, litere, cuvinte;

    cuvant=litere=cuvinte=0;

    while(fin.get(ch))
    {
        if((ch >= 'A' &&ch <= 'Z')||(ch >= 'a' && ch <= 'z'))
           {
               litere++;
               cuvant=1;
           }
           else
            {
                if(cuvant==1) cuvinte++;
                cuvant=0;
            }
    }

    fout << litere / cuvinte << "\n";
    fin.close();
    fout.close();
    return 0;
}