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

ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char a;
    int letters=0,words=0;
    while(f.get(a))
    {
         if(a>='a' && a<='z' || a>='A' && a<='Z')
            letters++;
         else if(letters>1 && a==' ' || a=='-')
            words++;
    }
    g<<letters/words;

    return 0;
}