#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char p[100];
    int i=0, lit=0, cuv=0;
    f.getline(p, 100);
    for (i=0; p[i]; i++)
    {
        if ((p[i]>='A' && p[i]<='Z') || (p[i]>='a' && p[i]<='z') || (p[i]>='0' && p[i]<='9'))
        {
            lit++;
            if (p[i-1]==' ' || p[i-1]=='-') cuv++;
        }
    }
    g<<lit/cuv;
    f.close();
    g.close();
    return 0;
}