#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

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

string s;
int l,nr_litere=0,cuv=0;

int main()
{
    getline(in, s);
    l=s.size();

    for (int i=0; i<=l-1; i++)
        if ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
            nr_litere++;
        else {
            if ((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z'))
                cuv++;
        }

    out << int(nr_litere/cuv) << "\n";

    return 0;
}