#include<fstream>
using namespace std;

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

int nrcuv,word,ltotal;

int main()
{
     char c;
    while (cin.get(c)) {
        if (('a'<=c && c<='z') || ('A'<=c && c<='Z')) {
            ltotal++;
            word=1;
        } else
        if (word==1) word=0,nrcuv++;
    }

    if (word)nrcuv++;
    cout<<ltotal/nrcuv;
    return 0;
}